GENTLE DENTAL SERVICE CORP
SC 13G, 1998-02-13
MISC HEALTH & ALLIED SERVICES, NEC
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G
                                 (Rule 13d-102)

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (Amendment No._______)*



                        Gentle Dental Service Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    37245B102
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).


                         (Continued on following pages)

                               Page 1 of 24 Pages
                       Exhibit Index Contained on Page 22


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 2 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel V L.P. ("AV")
                     Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION
                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
             NUMBER OF              5        SOLE VOTING POWER
              SHARES                         422,914 shares,  except that AV Assoc.,  the general partner of AV, and
           BENEFICIALLY                      Breyer, Evnin, Hill, Patterson,  Sednaoui, Swartz, ACPFP, JWBT and SFP,
     OWNED BY EACH REPORTING                 the  general  partners  of AV  Assoc.,  may be  deemed  to have  shared
            PERSON WITH                      voting with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             422,914 shares,  except that AV Assoc.,  the general partner of AV, and
                                             Breyer, Evnin, Hill, Patterson,  Sednaoui, Swartz, ACPFP, JWBT and SFP,
                                             the  general  partners  of AV  Assoc.,  may be  deemed  to have  shared
                                             dispositive power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             0 shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       422,914
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   5.5%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                      * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 3 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel Internet/Strategic Technology Fund L.P. ("AISTF")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
             NUMBER OF              5        SOLE VOTING POWER
              SHARES                         56,669 shares,  except that AISTF Assoc., the general partner of AISTF,
           BENEFICIALLY                      and Breyer,  Evnin, Hill, Patterson,  Sednaoui,  Swartz, ACPFP and SFP,
     OWNED BY EACH REPORTING                 the  managing  members of AISTF  Assoc.,  may be deemed to have  shared
             PERSON                          voting power with respect to such shares.
              WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             56,669 shares,  except that AISTF Assoc., the general partner of AISTF,
                                             and Breyer,  Evnin, Hill, Patterson,  Sednaoui,  Swartz, ACPFP and SFP,
                                             the  managing  members of AISTF  Assoc.,  may be deemed to have  shared
                                             dispositive power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             0 shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       56,669
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   0.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                      * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 4 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel Keiretsu V L.P. ("AKV")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         8,395  shares,  except  that AKV Assoc., the general partner of AKV and
          BENEFICIALLY                       Breyer,  Evnin,  Hill, Patterson, Sednaoui, and Swartz, managing members
    OWNED BY EACH REPORTING                  of AKV Assoc., may be deemed to have shared voting power with respect to 
             PERSON                          such shares.
              WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             8,395 shares,  except that AKV Assoc.,  the general  partner of AKV and
                                             Breyer, Evnin, Hill, Patterson,  Sednaoui,  and Swartz, managing members 
                                             of AKV Assoc.,  may be deemed to have shared dispositive power with 
                                             respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       8,395
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   0.1%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>



<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 5 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel Investors `96 L.P. ("AI96")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         25,186 shares,  except that Breyer,  Evnin,  Hill,  Patterson, Sednaoui
           BENEFICIALLY                      and Swartz,  the general partners of AI96, may be deemed to have shared
     OWNED BY EACH REPORTING                 voting powers with respect to such shares.
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             See response to row 5.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             25,186 shares, except that Breyer, Evnin, Hill, Patterson, Sednaoui and
                                             Swartz,  the  general  partners  of AI96,  may be deemed to have shared
                                             dispositive powers with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             See response to row 7.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       25,186
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   0.3%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 6 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel V Associates L.L.C. ("AV Assoc.")
                     Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             422,914  shares of which  422,914 are shares  directly  owned by AV. AV
                                             Assoc.  is the general  partner of AV, and may be deemed to have shared
                                             voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             422,914  shares of which  422,914 are shares  directly  owned by AV. AV
                                             Assoc.  is the general  partner of AV, and may be deemed to have shared
                                             dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       422,914
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   5.5%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   OO
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 7 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel Keiretsu V Associates L.L.C. ("AKV Assoc.")
                     Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             8,395  shares of which  8,395 are  shares  directly  owned by AKV.  AKV
                                             Assoc.  is the general partner of AKV, and may be deemed to have shared
                                             voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             8,395  shares of which  8,395 are  shares  directly  owned by AKV.  AKV
                                             Assoc.  is the general partner of AKV, and may be deemed to have shared
                                             dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       8,395
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   0.1%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   OO
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 8 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Accel Internet/Strategic Technology Fund Associates L.L.C. ("AISTF Assoc.")
                     Tax ID Number:
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             56,669 shares of which 56,669 are shares directly owned by AISTF. AISTF
                                             Assoc.  is the  general  partner  of  AISTF,  and may be deemed to have
                                             shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             56,669 shares of which 56,669 are shares directly owned by AISTF. AISTF
                                             Assoc.  is the  general  partner  of  AISTF,  and may be deemed to have
                                             shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       56,669
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   0.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   OO
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 9 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     ACP Family Partnership L.P. ("ACPFP")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     California
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             479,583  shares,  of which 422,914  shares are directly owned by AV and
                                             56,669 shares are directly owned by AISTF.  ACPFP may be deemed to have
                                             shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE VOTING POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             479,583  shares,  of which 422,914  shares are directly owned by AV and
                                             56,669 shares are directly owned by AISTF.  ACPFP may be deemed to have
                                             shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       479,583
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.2%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 10 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Swartz Family Partnership L.P. ("SFP")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     Delaware
- ----------- --------------------------------------------------------------------------------------------------------
             NUMBER OF              5        SOLE VOTING POWER
              SHARES                         0 shares
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             479,583  shares,  of which 422,914 are shares  directly owned by AV and
                                             56,669  shares are directly  owned by AISTF.  SFP may be deemed to have
                                             shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             479,583  shares,  of which 422,914 are shares  directly owned by AV and
                                             56,669  shares are directly  owned by AISTF.  SFP may be deemed to have
                                             shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       479,583
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ] 
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.2%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   PN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 11 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     The Breyer 1995 Trust dated 10/4/95 ("JWBT")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION
                     California
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             422,914 shares, of which 422,914 are shares directly owned by AV  JWBT
                                             may be deemed to have  shared  voting  power with  respect to such 
                                             shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             422,914 shares, of which 422,914 are shares directly owned by AV JWBT 
                                             may be deemed to have  shared  dispositive  power with  respect to 
                                             such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       422,914
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   5.5%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   OO
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 12 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     James W. Breyer ("Breyer")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly owned by AI96.  Breyer may
                                             be deemed to have shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly owned by AI96.  Breyer may
                                             be deemed to have shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       513,164
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 13 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Luke B. Evnin ("Evnin")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares directly owned by AI96. Evnin may be
                                             deemed to have shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares directly owned by AI96. Evnin may be
                                             deemed to have shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       513,164
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 14 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Eugene D. Hill, III ("Hill")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly owned by AI96. Hill may be
                                             deemed to have shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly owned by AI96. Hill may be
                                             deemed to have shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       513,164
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 15 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     Arthur C. Patterson ("Patterson")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         11,544  shares of which 11,544  are shares directly owned by Ellmore C.
           BENEFICIALLY                      Patterson  Partners ("ECPP").  Patterson is the general partner of ECPP
     OWNED BY EACH REPORTING                 and  may  be deemed to  have  sole voting power  with  respect to  such
              PERSON                         shares.
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly  owned by AI96.  Patterson
                                             may be deemed to have shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER
                                             11,544 shares of which 11,544 are shares  directly  owned by Ellmore C.
                                             Patterson Partners  ("ECPP").  Patterson is the general partner of ECPP
                                             and may be deemed to have sole  dispositive  power with respect to such
                                             shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly  owned by AI96.  Patterson
                                             may be deemed to have  shared  dispositive  power with  respect to such
                                             shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       524,708
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.8%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 16 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     G. Carter Sednaoui ("Sednaoui")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares directly owned by AI96. Sednaoui may
                                             be deemed to have shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER        
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares directly owned by AI96. Sednaoui may
                                             be deemed to have shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       513,164
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


<TABLE>
<CAPTION>
<S>                                                             <C>                    <C>
- --------------------------------------------------------                     ---------------------------------------
CUSIP NO. 37245B102                                             13 G                   Page 17 of 24 Pages
- --------------------------------------------------------                     ---------------------------------------

- ----------- --------------------------------------------------------------------------------------------------------
1           NAME OF REPORTING PERSONS
            SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

                     James R. Swartz ("Swartz")
- ----------- --------------------------------------------------------------------------------------------------------
2           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                   (a)  [ ]         (b)  [X]
- ----------- --------------------------------------------------------------------------------------------------------
3           SEC USE ONLY
- ----------- --------------------------------------------------------------------------------------------------------
4           CITIZENSHIP OR PLACE OF ORGANIZATION

                     U.S. Citizen
- ----------- --------------------------------------------------------------------------------------------------------
            NUMBER OF               5        SOLE VOTING POWER
              SHARES                         0 shares.
           BENEFICIALLY
     OWNED BY EACH REPORTING
              PERSON
               WITH
                                    -------- -----------------------------------------------------------------------
                                    6        SHARED VOTING POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly owned by AI96.  Swartz may
                                             be deemed to have shared voting power with respect to such shares.
                                    -------- -----------------------------------------------------------------------
                                    7        SOLE DISPOSITIVE POWER 
                                             0 shares.
                                    -------- -----------------------------------------------------------------------
                                    8        SHARED DISPOSITIVE POWER
                                             513,164  shares,  of which  422,914  are shares  directly  owned by AV,
                                             56,669 are shares  directly owned by AISTF,  8,395 are shares  directly
                                             owned by AKV and 25,186 are shares  directly owned by AI96.  Swartz may
                                             be deemed to have shared dispositive power with respect to such shares.
- ----------------------------------- -------- -----------------------------------------------------------------------
9           AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
            REPORTING PERSON                                                                       513,164
- ----------- --------------------------------------------------------------------------------------------------------
10          CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
            EXCLUDES CERTAIN SHARES*                                                                [ ]
- ----------- --------------------------------------------------------------------------------------------------------
11          PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                   6.7%
- ----------- --------------------------------------------------------------------------------------------------------
12          TYPE OF REPORTING PERSON*
                                                                                                   IN
- ----------- --------------------------------------------------------------------------------------------------------

<FN>
                                       * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>


                                                                   Page 18 of 24

ITEM 1(a).        NAME OF ISSUER:

                  Gentle Dental Service Corporation

ITEM 1(b).        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

                  22800 Savi Ranch Parkway, Suite 206
                  Yorba Linda, CA  92887

ITEM 2(a).        NAME OF PERSONS FILING:

                  This  Statement  is  filed  by  Accel  V  L.P.  ("AV"),  Accel
Internet/Strategic Technology Fund L.P. ("AISTF") Accel Keiretsu V L.P. ("AKV"),
Accel Investors'96 L.P. ("AI96"), Accel V Associates L.L.C. ("AV Assoc."), Accel
Keiretsu V Associates L.L.C. ("AKV Assoc."), Accel Internet/Strategic Technology
Fund Associates L.L.C. ("AISTF Assoc."),  ACP Family Partnership L.P. ("ACPFP"),
Swartz  Family  Partnership  L.P.  ("SFP"),  The Breyer 1995 Trust dated 10/4/95
("JWBT"), James W. Breyer ("Breyer"),  Luke B. Evnin ("Evnin"),  Eugene D. Hill,
III ("Hill"), Arthur C. Patterson ("Patterson"), G. Carter Sednaoui ("Sednaoui")
and James R. Swartz  ("Swartz").  The  foregoing  entities and  individuals  are
collectively referred to as the "Reporting Persons".

ITEM 2(b).        ADDRESS OF PRINCIPAL BUSINESS OFFICE, OR, IF NONE, RESIDENCE:

                  The address of the principal  business  office for each of the
Reporting Persons is:

                  428 University Avenue
                  Palo Alto, CA  94301

ITEM 2(c)         CITIZENSHIP:

                  AV, AISTF, AI96, and SFP are Delaware Limited Partnerships, AV
                  Assoc.,  AISTF  Assoc.  and AKV Assoc.  are  Delaware  Limited
                  Liability Companies, ACPFP is a California Limited Partnership
                  and  JWBT is a  California  Trust  and  Breyer,  Evnin,  Hill,
                  Patterson, Sednaoui and Swartz are United States citizens.

ITEM 2(d).        TITLE OF CLASS OF SECURITIES:

                  Common Stock

ITEM 2(e).        CUSIP NUMBER:

                  CUSIP # 37245B102

ITEM 3.           Not Applicable



<PAGE>


                                                                   Page 19 of 24

ITEM 4.           OWNERSHIP:

                  The following information with respect to the ownership of the
                  Common  Stock  of  the  issuer  by  the  persons  filing  this
                  Statement is provided as of December 31, 1997:

                     (a)   Amount beneficially owned:
                     
                           See Row 9 of cover page for each Reporting Person.
                     
                     (b)   Percent of Class:
                     
                           See Row 11 of cover page for each Reporting Person.
                     
                     (c)   Number of shares as to which such person has:
                  
                                 (i)   Sole power to vote or to direct the vote:

                                       See  Row  5  of   cover   page  for  each
                                       Reporting Person.

                                 (ii)  Shared  power  to vote or to  direct  the
                                       vote:

                                       See  Row  6  of   cover   page  for  each
                                       Reporting Person.

                                 (iii) Sole  power to  dispose  or to direct the
                                       disposition of:

                                       See  Row  7  of   cover   page  for  each
                                       Reporting Person.

                                 (iv)  Shared  power to dispose or to direct the
                                       disposition of:

                                       See  Row  8  of   cover   page  for  each
                                       Reporting Person.

ITEM 5.           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS:

                  Not applicable.


<PAGE>


                                                                   Page 20 of 24

ITEM 6.           OWNERSHIP  OF MORE THAN  FIVE  PERCENT  ON  BEHALF OF  ANOTHER
                  PERSON:

                                    Under certain circumstances set forth in the
                  limited partnership  agreements of AV, AKV, AI96 and AISTF and
                  the limited liability  agreements of AV Assoc., AKV Assoc. and
                  AISTF  Assoc.,  the general  and limited  partners or managing
                  members  as the  case may be of each of such  entities  may be
                  deemed to have the right to  receive  dividends  from,  or the
                  proceeds  from, the sale of shares of the issuer owned by each
                  such fund.


ITEM 7.           IDENTIFICATION  AND  CLASSIFICATION  OF THE  SUBSIDIARY  WHICH
                  ACQUIRED THE SECURITY  BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY:

                  Not applicable.


ITEM 8.           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP:

                  Not applicable


ITEM 9.           NOTICE OF DISSOLUTION OF GROUP:

                  Not applicable


ITEM 10.          CERTIFICATION:

                  Not applicable



<PAGE>


                                                                   Page 21 of 24

                                   SIGNATURES

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.

Dated:  February 13, 1998



Entities:

Accel V L.P.
Accel Internet/Strategic Technology Fund L.P.
Accel Keiretsu V L.P.
Accel Investors '96 L.P. 
Accel V Associates L.L.C.
Accel Keiretsu V Associates L.L.C.
Accel Internet/Strategic Technology Fund
    Associates L.L.C.
ACP Family Partnership L.P.                 By: /s/ G. Carter Sednaoui
The Breyer 1995 Trust dated 10/4/95             --------------------------------
Swartz Family Partnership L.P.                  G. Carter Sednaoui, as general
                                            partner or managing member or as 
                                            Attorney-in-fact for above-listed 
                                            entities



Individuals:

James W. Breyer
Luke B. Evnin
Eugene D. Hill, III
Arthur C. Patterson
G. Carter Sednaoui
James R. Swartz

                                            By: /s/ G. Carter Sednaoui
                                                --------------------------------
                                                G. Carter Sednaoui, 
                                            Individually and as Attorney-in-fact
                                            for above-listed individuals


<PAGE>


                                                                   Page 22 of 24

                                  EXHIBIT INDEX


                                                                     Found on
                                                                   Sequentially
Exhibit                                                            Numbered Page
- -------                                                            -------------
Exhibit A:  Agreement of Joint Filing                                   23

Exhibit B:  Reference to G. Carter Sednaoui as Attorney-in-Fact         24


<PAGE>


                                                                   Page 23 of 24

                                    EXHIBIT A

                            Agreement of Joint Filing

                  The  undersigned  hereby agree that a single  Schedule 13G (or
any amendment  thereto)  relating to the Common Stock of Gentle  Dental  Service
Corporation  shall be filed on behalf of each of the  undersigned  and that this
Agreement shall be filed as an exhibit to such Schedule 13G.


Date:  February 13, 1998



Entities:                                                                       
                                                                                
Accel V L.P.                                                                    
Accel Internet/Strategic Technology Fund L.P.                                   
Accel Keiretsu V L.P.                                                           
Accel Investors '96 L.P. 
Accel V Associates L.L.C.                              
Accel Keiretsu V Associates L.L.C.                                              
Accel Internet/Strategic Technology Fund                                        
    Associates L.L.C.                                                           
ACP Family Partnership L.P.                 By: /s/ G. Carter Sednaoui          
The Breyer 1995 Trust dated 10/4/95             --------------------------------
Swartz Family Partnership L.P.                  G. Carter Sednaoui, as general  
                                            partner or managing member or as    
                                            Attorney-in-fact for above-listed   
                                            entities                            
                                                                                
                                                                                
                                                                                
Individuals:                                                                    
                                                                                
James W. Breyer                                                                 
Luke B. Evnin                                                                   
Eugene D. Hill, III                                                             
Arthur C. Patterson                                                             
G. Carter Sednaoui                                                              
James R. Swartz                                                                 
                                                                                
                                            By: /s/ G. Carter Sednaoui          
                                                --------------------------------
                                                G. Carter Sednaoui,             
                                            Individually and as Attorney-in-fact
                                            for above-listed individuals        


<PAGE>


                                                                   Page 24 of 24

                                    EXHIBIT B

               REFERENCE TO G. CARTER SEDNAOUI AS ATTORNEY-IN-FACT



                  G.  Carter  Sednaoui  has signed  the  enclosed  documents  as
Attorney-In-Fact.  Note that copies of the  applicable  Power of  Attorneys  are
already on file with the appropriate agencies.





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