ENAMELON INC
S-3/A, 1999-05-14
MISC HEALTH & ALLIED SERVICES, NEC
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<PAGE>
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ---------------
                                 
                              Amendment No. 2     
                                       
                                    TO     
                                    FORM S-3
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
                                ---------------
                                 Enamelon, Inc.
             (Exact Name of Registrant as Specified in its Charter)
         Delaware             15 Kimball Avenue              13-3669775
     (State or other       Yonkers, New York 10704        (I.R.S. Employer
     jurisdiction of      Telephone: (914) 237-1308     Identification No.)
     incorporation or
      organization)
          
       (Address and telephone number of principal executive offices)     
                                ---------------
                               Dr. Steven R. Fox
                            Chief Executive Officer
                                 ENAMELON, INC.
                               15 Kimball Avenue
                            Yonkers, New York 10704
                           Telephone: (914) 237-1308
                           Telecopier: (914) 237-4024
 (Name, address, including zip code, and telephone number, including area code,
                             of agent for service)
                                ---------------
  A copy of all communications, including communications sent to the agent for
                           service should be sent to:
                               Jack Becker, Esq.
                            Snow Becker Krauss P.C.
                                605 Third Avenue
                           New York, N.Y. 10158-0125
                           Telephone: (212) 687-3860
                           Telecopier: (212) 949-7052
 
     Approximate Date of Proposed Sale to the Public: As soon as practicable
after the effective date of this registration statement.
 
     If the only securities being registered on this form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box. [ ]
     If any of the securities being registered on this form are to be offered
or delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [X]
     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following
box and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering. [ ]
     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. [ ]
     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [ ]
                                ---------------
                         
                      CALCULATION OF REGISTRATION FEE     
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<TABLE>   
<CAPTION>
                                                             Proposed
                                                Proposed      Maximum
 Title of each Class of        Amount           Maximum      Aggregate   Amount of
    Securities to be            to be        Offering Price  Offering   Registration
       Registered            Registered       per Share(1)   Price(1)       Fee
- ------------------------------------------------------------------------------------
<S>                      <C>                 <C>            <C>         <C>
Common Stock, $.001 par
 value.................  1,777,768 shares(2)   $7.875(3)    $13,999,923    $3,892
- ------------------------------------------------------------------------------------
Common Stock, $.001 par
 value.................    822,232 shares(2)   $4.125(4)     $3,391,707       943
- ------------------------------------------------------------------------------------
  Total................                                                    $4,835(5)
</TABLE>    
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- --------------------------------------------------------------------------------
   
(1) Estimated solely for the purpose of calculating the registration fee
    pursuant to Rule 457 under the Securities Act of 1933.     
   
(2) Represents shares that the selling securityholders named herein may acquire
    upon conversion of 500 shares of the Registrant's Series B Convertible
    Preferred Stock. This number includes an indeterminate number of shares
    that may become issuable in the event of a stock split, stock dividend or
    similar transaction involving the Common Stock pursuant to the antidilution
    provisions of the Series B Convertible Preferred Stock.     
   
(3) Calculated solely for the purpose of determining the registration fee
    pursuant to Rule 457(g)(3) based on the closing price of the Registrant's
    Common Stock on the Nasdaq National Market on January 13, 1999.     
   
(4) Calculated solely for the purpose of determining the registration fee
    pursuant to rule 457(g)(3) based on the closing price of the Registrant's
    Common Stock on the Nasdaq National Market on May 4, 1999.     
   
(5) Of this amount, $3,892 was previously paid.     
       
     The Registrant hereby amends this Registration Statement on such date or
dates as may be necessary to delay its effective date until the Registrant
shall file a further amendment which specifically states that this Registration
Statement shall thereafter become effective in accordance with Section 8(a) of
the Securities Act of 1933, as amended, or until the Registration Statement
shall become effective on such date as the Commission, acting pursuant to said
Section 8(a), may determine.
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<PAGE>
 
        
     Preliminary Prospectus, Subject to Completion, Dated May 14, 1999     
                                
                             1,257,134 Shares     
 
                                 Enamelon, Inc.
 
                                  Common Stock
                                          
   HFTP Investments LLC, Fisher              Our common stock is a speculative
Capital Ltd., and Wingate Capital         investment and involves a high
Ltd. are offering up to 1,257,134         degree of risk. You should read the
shares of the common stock of             description of certain risks under
Enamelon, Inc.                            the caption "Risk Factors"
                                          commencing on page 1 before
                                          purchasing our common stock.     
   
   Our common stock is quoted on The
Nasdaq National Market under the
symbol "ENML." On May 10, 1999, the
closing sale price of one share of
our common stock on the Nasdaq
National Market was $4.4375.     
 
                                             Neither the Securities and
                                          Exchange Commission nor any state
                                          securities commission has approved
                                          or disapproved these securities or
                                          determined whether this prospectus
                                          is truthful or complete. Any
                                          representation to the contrary is a
                                          criminal offense.
 
                               ----------------
 
                                 Enamelon, Inc.
                               15 Kimball Avenue
                            Yonkers, New York 10704
                                 (914) 237-1308
                               ----------------
 
                   The date of this Prospectus is      , 1999
 
    Information in this Prospectus is not complete and may be changed. A
 registration statement relating to these securities has been filed with the
 Securities and Exchange Commission. The selling securityholders may not sell
 these securities until the registration statement filed with the Securities
 and Exchange Commission is effective. This Prospectus is not an offer to
 sell these securities and it is not soliciting an offer to buy nor shall
 there be any sale of these securities in any state where the offer or sale
 is prohibited.
<PAGE>
 
                               TABLE OF CONTENTS
 
<TABLE>   
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Information About Enamelon.................................................   1
Risk Factors...............................................................   1
Forward-Looking Statements.................................................   8
Selling Securityholders....................................................   8
Plan of Distribution.......................................................  10
How to Obtain Additional Information About Enamelon........................  11
Information Incorporated by Reference......................................  11
Legal Matters..............................................................  12
Experts....................................................................  12
</TABLE>    
 
                                       i
<PAGE>
 
                           
                        Information About Enamelon     
   
      At Enamelon, Inc., we develop and market over-the-counter oral care
products that help stop cavities before they begin. Our initial product,
Enamelon(R) all-family toothpaste, uses our proprietary technologies to enhance
tooth remineralization. Our second product, Enamelon(R) Calcium Whitening
System toothpaste, uses our proprietary technologies to whiten teeth as it
strengthens and remineralizes them. We intend to use our proprietary
technologies, which include patented remineralizing technologies licensed from
the American Dental Association Health Foundation, to develop other
remineralizing products, such as a toothpaste for sensitive teeth, a mouthwash,
chewing gum, and other food and confectionery products.     
   
      We launched Enamelon(R) all-family toothpaste nationally in the first
quarter of 1998 and Enamelon(R) Calcium Whitening System toothpaste in the
first quarter of 1999. We have received governmental approval to sell our
toothpastes in Canada and plan to begin distribution there in late 1999 or
early 2000. We are also exploring distribution of our toothpastes in other
countries.     
                                  
                               Risk Factors     
             
          Risks Relating to Our Business and Financial Condition     
   
If we do not obtain additional financing, we will have to curtail or cease our
operations.     
   
      As of March 31, 1999, we had cash and cash equivalents of approximately
$8.1 million. We believe that we have sufficient funds to operate into June
1999, but we may need additional financing earlier. We may not be able to
obtain additional financing, which would require us to curtail or cease our
operations. Even if we obtain additional financing, it may be on terms that are
unfavorable to us or may be insufficient to enable us to continue to operate
according to our existing plans. Any additional financing may also result in
significant dilution to holders of our common stock.     
   
We have a limited operating history, so your basis for evaluating us is
limited.     
   
      Although we were incorporated in 1992, we did not begin to sell our
toothpaste nationally until the first quarter of 1998. Since our operating
history consists of only five quarters, our results of operations may not
actually be indicative of apparent trends. In addition, significant variations
from quarter to quarter may not be meaningful. Therefore, our limited operating
history may make it difficult for you to evaluate our performance and
prospects.     
   
We have a history of operating losses, we expect these losses to continue, and
we may never become profitable.     
   
      We have experienced losses from inception and expect to continue to incur
losses. From our inception in 1992 through December 31, 1997, which was before
the national distribution of Enamelon(R) toothpaste, we accumulated net losses
of approximately $15.5 million. We also incurred a net loss of approximately
$29.1 million for the year ended December 31, 1998, on net sales of
approximately $14.3 million. Our loss for the quarter ended March 31, 1999 was
approximately $8.1 million. As of March 31, 1999, our accumulated deficit was
approximately $52.7 million. We believe that we will continue to incur losses
principally due to expenditures on marketing Enamelon(R) toothpaste and our
research and development program. Our revenues may not increase as a result of
this spending. Even if our revenues increase, we may not become profitable. If
we become profitable, we may be unable to sustain profitability.     
   
Our success will depend initially on the success of our toothpaste products,
our only product lines.     
   
      For the foreseeable future, we expect to derive substantially all of our
revenues from sales of our toothpastes. We do not presently market any other
products, and we may not develop other products in the future. Therefore, if we
cannot sell Enamelon(R) toothpastes profitably, we will continue to sustain
losses. You
    
<PAGE>
 
   
should not expect us to be able to acquire or develop new products or services
that we can sell profitably, if we cannot sell our toothpaste profitably.     
 
Our limited resources may impair our ability to market our products
successfully.
   
      Successful marketing of toothpastes and other oral care products requires
heavy and sustained advertising and promotion. To increase our sales, we will
have to make more consumers and dental professionals aware of our products and
what distinguishes them from popular, brand-name toothpastes. We believe that
this will require us to make substantial cash payments for media and print
advertising and promotion as well as professional marketing programs. In 1998,
we spent approximately $31 million on marketing and sales. Our current and
future cash resources, however, may be insufficient to enable us to market our
products as planned to increase our sales.     
   
Our internal sales team is new and has little experience in selling our
products.     
   
      Through 1998, we used an unaffiliated sales management company to
supervise and train the independent brokers that sell our products to our
customers. In July 1998, we hired a Vice President--Sales and in late 1998 and
early 1999, we hired three regional sales managers to replace the sales
management company. Therefore, our new internal sales force has had only
limited experience in selling our products. Their failure to successfully
increase the distribution of our products and effectively train and supervise
the brokers that sell them would have a material adverse effect on our sales
and profitability.     
                    
                 Risks Relating to Governmental Regulation     
   
The federal Food and Drug Administration could assert that our toothpastes or
their labeling do not meet the conditions of its Monograph on fluoride
toothpastes.     
   
      Enamelon(R) toothpastes are subject to regulation as non-prescription
drugs by the FDA. The FDA has published a final monograph, Anticaries Drug
Products for Over-the-Counter Human Use, which establishes conditions under
which non-prescription drug products that aid in the prevention of dental
caries or cavities are generally recognized as being safe and effective and not
misbranded. We are relying on that Monograph to sell Enamelon(R) toothpastes to
the public. If the FDA were to assert that our toothpastes or their labeling do
not meet the conditions of the Monograph, we would have to take one of the
following actions to continue selling them:     
       
    1. contest the FDA's assertion;     
       
    2. modify the formulation or labeling of our products;     
       
    3. submit a New Drug Application with the FDA for our products, which,
       if approved, would permit us to sell them without reliance on the
       Monograph.     
   
Taking any of those actions could be costly and time consuming and would not
assure that we could continue to sell our toothpastes in their current
formulations or packaging. We might also be required to suspend sales of our
toothpastes until we modified their formulation or labeling or the FDA approved
our NDA. Any of those consequences could have a material adverse effect on our
business, operations and financial results.     
   
Our contract manufacturers may violate FDA "Good Manufacturing Practices,"
which could adversely affect us.     
   
      The FDA also regulates manufacturing of oral care drug products. If a
drug manufacturing facility fails to comply with the FDA's Good Manufacturing
Practices, then the FDA can prevent products manufactured at that facility from
being marketed. We presently use, and plan to continue to use, only one third-
party contractor to manufacture our toothpastes, and we have no control over
its compliance with GMP's. If we cannot obtain our products from our current
contract manufacturer, we may not be able to timely contract     
 
                                      -2-
<PAGE>
 
   
with another manufacturer. This would require us to delay or suspend shipments
of our products. Even if we were able to find a new contract manufacturer, we
may not be able to negotiate an agreement with the new manufacturer on terms as
favorable as those of the prior manufacturer. The FDA could also take
enforcement action and require us to recall or discontinue the sale of the
affected products. Any of those results could have a material adverse effect on
our business, operations and financial results.     
   
The results of our human clinical studies may not support promotional claims
that would distinguish Enamelon(R) toothpastes from other fluoride toothpastes.
       
      FDA regulations allow us to make certain claims for our toothpastes on
their labels, packages, and other labeling. These claims are generally referred
to as "labeling claims." We can make additional "promotional claims" for our
products in advertising and other promotional materials, provided that we have
adequate substantiation to support them. Based on the results of our previous
laboratory studies, we believe that human clinical studies will enable us to
make additional promotional claims, including claims comparing our toothpastes
favorably with other fluoride toothpastes. We are now conducting such studies.
If the results of those studies are adverse or inconclusive, however, we may be
unable to make the anticipated promotional claims. If we cannot make
comparative and other promotional claims based on our studies, it will be
difficult for us to distinguish Enamelon(R) toothpastes from other fluoride
toothpastes. This could adversely affect our ability to market Enamelon(R)
toothpastes, both to consumers and to dental professionals.     
 
Our competitors, the FTC, or other governmental or private agencies could
challenge the accuracy of our promotional claims or the adequacy of the data
that we relied on to substantiate them.
   
      We are making and expect to make promotional claims for our oral care
products based on our laboratory and human studies. Defending challenges to our
promotional claims could be costly and divert management attention. If a
competitor or other third party successfully challenges the accuracy of our
promotional claims or the adequacy of the data that we relied on to make them,
a court or other adjudicating authority could require us to modify or stop
making the claim and place limits on future promotional claims. Resulting
limitations on promotional claims could make it more difficult to differentiate
our oral care products from those of our competitors, which could make it more
difficult and expensive to market them.     
   
Our products as formulated and labeled for the United States market may not
comply with foreign regulations, which could adversely affect our ability to
market our products outside the United States.     
   
      We plan to market our toothpastes and other oral care products
internationally, either directly or through distributors, joint venture
partners or licensees. The production and marketing of these products are
subject to governmental regulation in other countries. In order to market our
products there, we may have to reformulate or relabel them to comply with
foreign regulations, which could be costly and delay their introduction. It is
possible that reformulation or repackaging would be prohibitively expensive or
that we could not reformulate the products to comply with the foreign
regulations, which would keep us from marketing our products in those
countries. If we cannot market our products in foreign countries, our
opportunity to expand our revenues will be restricted to the United States
market.     
                     
                  Risks Relating to Intellectual Property     
   
We may not be able to protect our patents and proprietary rights.     
   
      In formulating our toothpastes, we have used our own patented and
proprietary technology as well as patented remineralizing technology licensed
from the American Dental Association Health Foundation. We also expect to use
the patented technology that we own and license to formulate other oral care
products that we expect to market. We rely on these patents to protect us
against competitors using the same technology in competing products. Since no
other toothpaste can legally use this patented technology, we also rely on our
exclusive rights to use this technology to distinguish our toothpastes from
other fluoride toothpastes.     
 
                                      -3-
<PAGE>
 
   
Competitors could violate, challenge the validity of, or attempt to circumvent
our or the ADAHF's patent rights, or they could assert patent infringement
claims against us or the ADAHF. Confidentiality agreements that we require our
employees, consultants, advisors and contractors to sign may not deter them
from using or disclosing our unpatented know-how and other trade secrets. In
any of those cases, we could be required to spend significant financial and
management resources to protect or defend our rights. If we were unsuccessful,
our competitors would have the ability to use the same technology as we are
using, and they might even be able to require us to license the technology from
them or to keep us from using it ourselves. If others use the technology that
we rely on, or keep us from using it, it would be more difficult for us to
distinguish our toothpastes and other oral care products from those of our
competitors. We might also have the to pay license fees, which would increase
our cost of goods sold. Any of these consequences could have a material adverse
effect on our ability to market our products and to compete effectively in the
oral care industry, which could adversely affect our business, operations and
financial results.     
                        
                     Risks Relating to Our Operations     
   
We have many competitors, and we may not be able to compete effectively against
them.     
   
      Competition in the business of selling toothpaste and other over-the-
counter oral care products is intense. We may not have the financial resources,
technical expertise, or sales and marketing capabilities to compete
effectively. If we are unable to compete successfully, our business, financial
condition and results of operations will be adversely affected.     
   
      Our competitors include the following national and multi-national
consumer products companies and their brand names toothpastes:     
 
<TABLE>   
<CAPTION>
           Company                   Product
         <S>                         <C>
         .Procter & Gamble Co.       Crest
         .Colgate-Palmolive Company  Colgate
         .SmithKline Beechman        Aquafresh
         .Chesebrough-Ponds USA Co.  Mentadent
         .Church & Dwight Co., Inc.  Arm & Hammer Dental Care
         .Block Drug Co., Inc.       Sensodyne
</TABLE>    
   
These competitors or their products have:     
       
    .longer operating histories     
       
    .greater name recognition     
       
    .wider product distribution     
       
    .more and larger facilities     
       
    .significantly greater financial, technical and marketing resources     
   
      We believe that our success will depend on acceptance of our toothpastes
as alternatives to our competitors' brand-name toothpastes. Our ability to
demonstrate the benefits of using Enamelon(R) toothpastes to consumers and
dentists will depend in part on our competitors' response to our advertising
and promotional campaigns. Our competitors may devote greater resources to the
development, promotion and sale of their products than we can to the sale of
our products. They may also develop toothpaste or other OTC oral care products
that are superior to or have greater market acceptance than ours. Our
competitors may also engage in more extensive research and development,
undertake more extensive marketing campaigns, and adopt more     
 
                                      -4-
<PAGE>
 
   
aggressive pricing policies than we can. All of these factors would make it
more difficult to market our products effectively and to achieve profitability.
       
We may not be able to develop new products using our proprietary technologies.
       
      We are attempting to develop new products, such as chewing gum, candies,
mouth rinses, and oral sprays, using our proprietary technologies. We may never
succeed in developing any of those products. Even if we are able to achieve
profitability from the sale of our toothpastes, our revenues and profitability
will be limited if we cannot develop new products using our proprietary
technologies.     
   
Our product formulations might change, which could require us to spend
additional resources.     
   
      We expect the formulations of our toothpastes and other products to
evolve over time due to our continuing research and product testing. As a
result of this evolution, our products, and the manner in which we manufacture
them, may change. Therefore, our existing proprietary technologies may become
obsolete. In that event, we may have to spend substantial cash and personnel
resources to develop and test these new formulations and to secure patent
rights covering the new technologies. Notwithstanding such substantial
expenditures, we may not be able to effectively market those products.     
   
We depend entirely on third-party contractors to manufacture our products, and
those contractors may not always be available.     
   
      We are using only one contract manufacturer to manufacture our
toothpastes. Other contract manufacturers are the sole sources for our dual-
chamber toothpaste tubes and some of the raw materials that we use to make our
toothpastes. If any current manufacturer were to become unavailable, we may not
be able to find a satisfactory replacement manufacturer or the terms of our
agreement with a replacement manufacturer may not be as favorable to us as our
current manufacturer's terms. Changing contract manufacturers could, among
other things, increase our costs or result in delays in shipping our products
or shortages in stores. Those consequences could have a material adverse effect
on our ability to market our products effectively and on our results of
operations.     
   
Product liability claims against us could exceed the amount of our insurance.
       
      The manufacture and sale of consumer products exposes the manufacturer to
the risk of significant damages from product liability claims. We maintain
insurance against product liability claims in the amount of $1 million and
excess general liability and product liability insurance of $15 million. Those
coverage limits, however, may not be adequate, or we may not be able to procure
such insurance at acceptable costs in the future. A successful claim in excess
of our insurance coverage could have a material adverse effect on our business,
financial condition and results of operations.     
   
The loss of key members of our management and product development team could
adversely affect our product development or marketing.     
   
      Dr. Steven R. Fox, our founder and Chief Executive Officer, is
responsible for our strategic planning. As a dentist, he is particularly well
qualified to explain the benefits of our oral care products to the professional
and financial community. Kim Hardingham, our President and Chief Operating
Officer, has extensive experience in launching new toothpaste products and
subsequent domestic and international marketing of those products. We are
relying on him to develop and implement our domestic and international
marketing plans. Anthony Winston, our Vice President--Technology and Clinical
Research, is responsible both for improving our existing technology and
developing new technology and for conducting our research programs. Norman
Usen, our Vice President--Product Development, is responsible for improving our
existing product formulations and developing new formulations. Each of these
individuals plays a significant role in the development and marketing of our
toothpastes and other oral care products. The loss of and our inability to
promptly replace any of these individuals could significantly delay and may
prevent the achievement of our research, development and business objectives.
    
                                      -5-
<PAGE>
 
                        
                     Risks Relating to Our Securities     
   
Our management's interests in voting their shares may conflict with our
interests and those of our other stockholders.     
   
      As a result of their stock ownership, our management will be able to
affect significantly corporate actions such as mergers and takeover attempts in
a manner that could conflict with the interests of our public stockholders. As
of May 10, 1999, management owned 2,790,523 shares of our common stock and had
currently exercisable options to purchase 1,125,720 shares of common stock.
Based on their ownership of common stock and options, management owned
beneficially 34.1% of our common stock and will own beneficially 30.9% of our
common stock if the selling securityholders sell all shares offered by this
prospectus.     
   
Results of our operations and other factors affecting our business could result
in sharp changes in our common stock price.     
   
      Since our initial public offering in October 1996, our common stock has
traded at prices ranging between $3.25 and $27.50, and in the last 12 months it
has traded at prices ranging from $3.25 to $14.125. Factors contributing to
this volatility include:     
       
    .fluctuations in our quarterly operating results;     
 
    .our announcements of the issuance of patents or other technological
    innovations;
       
    .our or our competitor's announcements of new products or technologies;
           
    .announcement of the results of our clinical studies;     
       
    .  our funding requirements and sales of our common stock or other
       securities, including our series B convertible preferred stock.     
   
Many of these factors are beyond our control and may ffect the market price of
our common stock regardless of our operating performance.     
   
Shares eligible for future public sale by our current securityholders may
adversely affect the market price of our common stock.     
   
      We had 10,289,536 shares of common stock outstanding as of May 10, 1999.
Holders of substantially all of those shares can sell them publicly, subject to
limitations under the securities laws on the number of shares that can be sold
publicly during any three-month period. We have also reserved for issuance a
total of 5,503,508 shares of common stock upon the exercise of outstanding
options and warrants and the conversion of our series B convertible preferred
stock. All of those shares can be sold publicly after issuance under
registration statements filed or to be filed with the SEC or an exemption from
registration. In addition, if the price of our common stock declines, we may be
required to reserve additional shares for issuance on conversion of our series
B convertible preferred stock. We are also required to file a registration
statement with the SEC so that holders of those additional shares can sell them
publicly.     
   
      If our securityholders sell publicly a substantial number of shares
issued on the exercise of outstanding options and warrants or on the conversion
of our series B convertible preferred stock, then the market price of our
common stock could fall. Public perception that those sales will occur could
also adversely affect the price of our common stock. Furthermore, the existence
of securities of this type often exerts downward pressure on an issuer's stock
price. A decline in the price of our common stock could also impair our ability
to raise capital through the sale of equity securities.     
 
                                      -6-
<PAGE>
 
   
Holders of our series B convertible preferred stock could convert it and sell
our common stock publicly while its market price is declining.     
   
      Holders of our series B convertible preferred stock may convert it at a
conversion price equal to the lower of $6.8665 or 95.5% of the average of the
five lowest closing sale prices of our common stock in the 40 trading days
immediately preceding the date of conversion. The number of shares of common
stock issuable on conversion is equal to the sum of $10,000 per share of series
B convertible preferred stock plus an accrual amount equal to 6% per year
divided by the conversion price. Based on a conversion price of $4.0708 on May
10, 1999, which is approximately $.37 less than the last sale price of our
common stock on that date, we would have issued up to 1,257,134 shares of
common stock on conversion of the series B convertible preferred stock. Since
we are required to issue additional shares if the conversion price declines, we
have registered for resale up to 2,600,000 shares of common stock, which would
become issuable upon conversion of the series B convertible preferred stock if
the conversion price fell as low as approximately $2.00 per share. If the
conversion price fell even further, we would be required to issue and register
more than 2,600,000 shares. Since there is no lower limit on the conversion
price, we would be required to issue an increasingly larger number of shares of
common stock as its price declines. The conversion of the series B convertible
preferred stock and subsequent sale of common stock to the public under this
prospectus could have the further effect of exacerbating the decline or slowing
increases in the price of our common stock. It could also result in additional
dilution to our current stockholders. The holders of our series B convertible
preferred stock could also engage in short sales of our common stock, which
could contribute to a decline in its price and result in additional dilution.
       
If we cannot satisfy Nasdaq's continued listing requirements, it may delist our
common stock.     
   
      Our common stock is quoted on the Nasdaq National Market System. To
continue to be listed on NMS, we are required to maintain net tangible assets
of $4,000,000, our common stock must maintain a minimum bid price of $1.00 per
share, and we must have at least two market makers. We may not be able to
continue to satisfy all of those maintenance requirements. As of March 31,
1999, we had net tangible assets of approximately $9 million, and as of May 10,
1999, the closing price of our common stock was $4.438, and we had 14 market
makers. If we do not obtain additional financing, it is unlikely that we will
be able to continue to satisfy the net tangible assets requirement.     
   
      The conversion of our series B convertible preferred stock could also
have consequences that could cause Nasdaq to delist our common stock. If the
conversion and sale of our series B convertible preferred stock result in a
decline in our common stock price, as discussed in the prior risk factor, the
minimum bid price for our common stock could fall below $1.00. Nasdaq could
also delist our common stock if it deems it necessary to protect investors and
the public interest. If Nasdaq were to determine that the returns on our series
B convertible preferred stock are excessive compared with the returns received
by the holders of our common stock, and those excess returns were egregious,
Nasdaq could delist our common stock.     
   
      If we are delisted from the NMS, we may not qualify for listing on the
Nasdaq SmallCap Market. In that case, our common stock would be traded in the
over-the-counter market and quoted in the NASD's "Electronic Bulletin Board" or
the "pink sheets." These sources do not provide the same type of current
trading information as Nasdaq. In addition, the over-the-counter market does
not afford the same liquidity for securities as Nasdaq. Consequently, it may be
more difficult for an investor to obtain price quotations for our common stock
or to sell it if it is delisted from Nasdaq.     
   
If our common stock is delisted, it may become subject to the SEC's "penny
stock" rules and be more difficult for you to sell.     
   
      SEC rules require brokers to provide information to purchasers of
securities traded at less than $5.00 and not traded on a national securities
exchange or quoted on the Nasdaq Stock Market. If our common stock     
 
                                      -7-
<PAGE>
 
becomes a "penny stock" that is not exempt from the SEC rules, these disclosure
requirements may have the effect of reducing trading activity in our common
stock and make it more difficult for investors to sell. The rules require a
broker-dealer to deliver a standardized risk disclosure document prepared by
the SEC that provides information about penny stocks and the nature and level
of risks in the penny stock market. The broker must also give bid and offer
quotations and broker and salesperson compensation information to the customer
orally or in writing before or with his confirmation. The SEC rules also
require a broker to make a special written determination that the penny stock
is a suitable investment for the purchaser and receive the purchaser's written
agreement to the transaction before a transaction in a penny stock.
 
Other issuances of preferred stock could adversely affect existing holders of
our common stock.
 
      Under our certificate of incorporation, our Board of Directors may,
without further stockholder approval, issue up to an additional 4,999,500
shares of preferred stock with dividend, liquidation, conversion, voting or
other rights that could adversely affect the voting power or other rights of
the holders of common stock. We could use new classes of preferred stock as a
method of discouraging, delaying or preventing a change in persons that control
us. In particular, the terms of the preferred stock could effectively restrict
our ability to consummate a merger, reorganization, sale of all or
substantially all of our assets, liquidation or other extraordinary corporate
transaction without the approval of the holders of the preferred stock. We
could also create a class of preferred stock with rights and preferences
similar to those of the series B convertible preferred stock, which could
result in substantial dilution to holders of our common stock or adversely
affect its market price. The 500 shares of series B convertible preferred stock
are the only shares of preferred stock outstanding.
 
Delaware law anti-takeover provisions and our classified board could also make
it more difficult for a third party to acquire control of us.
 
      We are a Delaware corporation. Anti-takeover provisions of Delaware law
could make it more difficult for a third party to acquire control of us. In
addition, our by-laws provide for a classified board, with each board member
serving a staggered two-year term. The classified board could also make it more
difficult to acquire us.
 
                           Forward-Looking Statements
 
      Some of the information in this prospectus and the documents we
incorporate by reference may contain forward-looking statements. These
statements can be identified by the use of forward-looking terminology such as
"may," "will," "expect," "believe," "intend," "anticipate," "estimate,"
"continue" or similar words. They discuss future expectations, estimate the
happening of future events, anticipate our future financial condition or state
other "forward-looking" information. When considering such forward-looking
statements, you should keep in mind the risk factors and other cautionary
statements in this prospectus and the documents that we incorporate by
reference. The risk factors provided in this prospectus and other factors noted
throughout this prospectus and the documents that we incorporate by reference,
including certain risks and uncertainties, could cause our actual results to
differ materially from those contained in any forward-looking statement.
 
                            Selling Securityholders
   
      The table below lists the selling securityholders and other information
regarding the beneficial ownership of our common stock by each of the selling
securityholders. The second column lists the number of shares of common stock
that would have been issuable to each selling securityholder on May 10, 1999
upon conversion of all of our series B convertible preferred stock then held by
that selling securityholder, including shares issuable to pay the 6% accrual
amount as of that date. Our conversion calculations in the second column     
 
                                      -8-
<PAGE>
 
   
assume a conversion price for our series B convertible preferred stock of
$4.0708, which represents 95.5% of the average of the five lowest closing sale
prices during the 40 consecutive trading days before May 10, 1999. The numbers
listed in the second column are subject to fluctuations from time to time based
on changes in the closing sale price of our common stock. The third column
lists each selling securityholder's pro rata portion of the 2,600,000 shares of
common stock registered for sale on conversion of our series B convertible
preferred stock. The 2,600,000 shares of common stock shown in the table
represent approximately 200% of the shares that would have been issuable to the
selling securityholders on May 10, 1999 on conversion of all of the series B
convertible preferred stock. The fourth column assumes the sale of all of the
shares offered by each selling securityholder.     
   
      Under our series B convertible preferred stock certificate of
designations, no selling securityholder can convert series B convertible stock
to the extent such conversion would cause such selling securityholder's
beneficial ownership of our common stock (other than shares deemed beneficially
owned through ownership of unconverted shares of our series B convertible
preferred stock) to exceed 4.99% of the outstanding shares of common stock. In
addition, we are not required to issue shares of our common stock on conversion
of our series B convertible preferred stock if any holder, together with its
affiliates, (1) would beneficially own more than 10% of our outstanding common
stock after conversion and (2) would have acquired more than 10% of our common
stock in the 60-day period ending on the date of conversion. The information
provided in the table below has been obtained from the selling securityholders.
The selling securityholders may sell all, some or none of their shares in this
offering. See "Plan of Distribution."     
 
<TABLE>   
<CAPTION>
                                                                Shares Owned
                                                               After Offering
                                                              -----------------
                                               Maximum Number
    Name of Selling             Shares Owned     of Shares
    Securityholder             Before Offering    Offered     Number Percentage
    ---------------            --------------- -------------- ------ ----------
   <S>                         <C>             <C>            <C>    <C>
   HFTP Investments
    LLC(/1/).................      628,567       1,300,000       0      --
   Fisher Capital Ltd.(/2/)..      409,826         847,600       0      --
   Wingate Capital
    Ltd.(/2/)................      218,741         452,400       0      --
</TABLE>    
- --------
(1) Promethean Investment Group L.L.C. is the investment manager of HFTP
    Investments LLC ("HFTP") and consequently has voting control and investment
    discretion over securities held by HFTP. Promethean Investment Group,
    L.L.C. is indirectly controlled by Mr. James F. O'Brien. Mr. O'Brien
    disclaims beneficial ownership of the shares beneficially owned by
    Promethean Investment Group L.L.C. and HFTP.
   
(2) Citadel Limited Partnership is the trading manager of each of Fisher
    Capital Ltd. and Wingate Capital Ltd. (collectively, the "Citadel
    Entities") and consequently has voting control and investment discretion
    over securities held by the Citadel Entities. Kenneth C. Griffin indirectly
    controls Citadel Limited Partnership. The ownership for each of the Citadel
    Entities does not include the ownership information for the other Citadel
    Entity. Citadel Limited Partnership, Kenneth C. Griffin, and each of the
    Citadel Entities disclaims ownership of the shares held by the other
    Citadel Entities.     
 
      We are registering the shares for resale by the selling securityholders
in accordance with registration rights granted to the selling securityholders.
We will pay the registration and filing fees, printing expenses, listing fees,
blue sky fees, if any, and fees and disbursements of our counsel and the
selling security holders' counsel in connection with this offering, but the
selling securityholders will pay any underwriting discounts, selling
commissions and similar expenses relating to the sale of the shares. In
addition, we have agreed to indemnify the selling securityholders, underwriters
who they may select, and certain affiliated parties against certain
liabilities, including liabilities under the Securities Act, in connection with
this offering. The selling securityholders have agreed to indemnify us and our
directors and officers, as well as any person that controls us, against certain
liabilities, including liabilities under the Securities Act. Insofar as
indemnification for liabilities under the Securities Act may be permitted to
our directors or officers, or persons that control us, we have been informed
that in the opinion of the SEC such indemnification is against public policy as
expressed in the Securities Act and is therefore unenforceable.
 
                                      -9-
<PAGE>
 
                             Plan of Distribution
 
      The selling securityholders (or, subject to applicable law, their
pledgees, donees, distributees, transferees or other successors in interest)
may sell shares from time to time in public transactions, on or off The Nasdaq
National Market, or private transactions, at prevailing market prices or at
privately negotiated prices, including but not limited to, one or any
combination of the following types of transactions:
 
      .ordinary brokers' transactions;
 
    .transactions involving cross or block trades or otherwise on the Nasdaq
    National Market;
 
    .  purchases by brokers, dealers or underwriters as principal and resale
       by such purchasers for their own accounts pursuant to this
       prospectus;
 
    .""at the market" to or through market makers or into an existing market
    for the common stock;
 
    .  in other ways not involving market makers or established trading
       markets, including direct sales to purchasers or sales effected
       through agents;
 
    .through transactions in options, swaps or other derivatives (whether
    exchange-listed or otherwise);
 
    .in privately negotiated transactions; or
 
    .  to cover short sales.
 
      In effecting sales, brokers or dealers engaged by the selling
securityholders may arrange for other brokers or dealers to participate in the
resales. The selling securityholders may enter into hedging transactions with
broker-dealers, and in connection with those transactions, broker-dealers may
engage in short sales of the shares. The selling securityholders also may sell
shares short and deliver the shares to close out such short positions. The
selling securityholders also may enter into option or other transactions with
broker-dealers that require the delivery to the broker-dealer of the shares,
which the broker-dealer may resell pursuant to this prospectus. The selling
securityholders also may pledge the shares to a broker or dealer, and upon a
default, the broker or dealer may effect sales of the pledged shares pursuant
to this prospectus.
 
      Brokers, dealers or agents may receive compensation in the form of
commissions, discounts or concessions from selling securityholders in amounts
to be negotiated in connection with the sale. The selling securityholders and
any participating brokers or dealers may be deemed to be "underwriters" within
the meaning of the Securities Act in connection with such sales and any such
commission, discount or concession may be deemed to be underwriting
compensation.
 
      Information as to whether underwriters who the selling securityholders
may select, or any other broker-dealer, is acting as principal or agent for
the selling securityholders, the compensation to be received by underwriters
that the selling securityholders may select or by any broker-dealer acting as
principal or agent for the selling securityholders, and the compensation to be
paid to other broker-dealers, in the event the compensation of such other
broker-dealers is in excess of usual and customary commissions, will, to the
extent required, be set forth in a supplement to this prospectus. Any dealer
or broker participating in any distribution of the shares may be required to
deliver a copy of this prospectus, including a prospectus supplement, if any,
to any person who purchases any of the shares from or through such dealer or
broker.
 
      We have advised the selling securityholders that during such time as
they may be engaged in a distribution of the shares they are required to
comply with Regulation M promulgated under the Securities Exchange Act. With
certain exceptions, Regulation M precludes any selling securityholder, any
affiliated purchasers and any broker-dealer or other person who participates
in such distribution from bidding for or purchasing, or attempting to induce
any person to bid for or purchase any security that is the subject of the
distribution until the entire distribution is complete. Regulation M also
prohibits any bids or purchases made in
 
                                     -10-
<PAGE>
 
order to stabilize the price of a security in connection with the distribution
of that security. All of the foregoing may affect the marketability of the
common stock.
   
     We will not receive any of the proceeds from the selling securityholders'
sale of their common stock.     
               
            How To Obtain Additional Information About Enamelon     
 
     We file reports, proxy statements and other information with the SEC. You
may read and copy any document we file at the Public Reference Room of the SEC
at Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, and at the
Regional Offices of the SEC at Seven World Trade Center, Suite 1300, New York,
New York 10048, and at 500 West Madison Street, Suite 1400, Chicago, Illinois
60661-2511. Please call 1-800-SEC-0330 for further information concerning the
Public Reference Room. Our filings also are available to the public from the
SEC's website at www.sec.gov. We distribute to our stockholders annual reports
containing audited financial statements.
 
                     Information Incorporated by Reference
 
     The SEC allows us to "incorporate by reference" the information that we
file with it, which means that we can disclose important information to you by
referring to those documents. The information incorporated by reference is
considered to be part of this prospectus, and information we file later with
the SEC will automatically update and supersede this information. We
incorporate by reference the documents listed below and any future filings that
we make with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities
Exchange Act until the offering is completed:
 
     1.Annual Report on Form 10-KSB for the fiscal year ended December 31,
1998.
        
     2.Proxy Statement dated April 16,1999.     
   
     3.Quarterly Report on Form 10-Q for the fiscal quarter ended March 31,
1999.     
       
    4. The description of our common stock contained in our Registration
       Statement on Form 8-A (File No. 0-21595) under Section 12 of the
       Securities Exchange Act.     
       
    5. The description of our series B Convertible preferred stock contained
       in our Form 8-K, dated December 18, 1998.     
 
You may request a copy of these filings, at no cost, by writing or calling us
at:
 
                                 Enamelon, Inc.
                              7 Cedar Brook Drive
                           Cranbury, New Jersey 08512
                       Attention: Chief Financial Officer
                           Telephone: (609) 395-6900
 
     This prospectus is part of a registration statement that we filed with the
SEC. You should rely only on the information or representations provided in
this prospectus. We have not authorized anyone to provide you with different
information. The common stock will not be offered in any state where an offer
is not permitted. You should not assume that the information in this prospectus
is accurate as of any date other than the date on the cover of this prospectus.
 
                                      -11-
<PAGE>
 
                                 Legal Matters
 
      The validity of the shares of common stock offered hereby has been passed
upon by Snow Becker Krauss P.C., 605 Third Avenue, New York, New York 10158.
SBK Investment Partners, a partnership consisting of member of Snow Becker
Krauss P.C., owns 107,325 shares of common stock. In addition, certain members
of Snow Becker Krauss P.C. beneficially own common stock individually.
 
                                    Experts
 
      The consolidated financial statements of Enamelon, Inc. at December 31,
1998 and for the years ended December 31, 1997 and 1998, appearing in our
Annual Report on Form 10-KSB for the year ended December 31, 1998, have been
audited by BDO Seidman LLP, independent auditors, as set forth in their report
thereon incorporated herein by reference. Such consolidated financial
statements are incorporated herein by reference in reliance upon such report
given upon the authority of such firm as experts in accounting and auditing.
 
                                      -12-
<PAGE>
 
                                    Part II
 
                   Information Not Required in the Prospectus
 
Item 14. Other Expenses of Issuance and Distribution.
 
      The expenses payable by the Registrant in connection with the issuance
and distribution of the securities being registered are estimated below:
 
<TABLE>   
      <S>                                                                <C>
      SEC registration fee.............................................. $ 4,835
      Listing fees......................................................  17,500
      Legal fees and expenses...........................................  30,000
      Printing expenses.................................................  10,000
      Accounting fees...................................................   5,000
      Miscellaneous.....................................................   5,165
                                                                         -------
        Total........................................................... $72,500
</TABLE>    
 
Item 15. Indemnification of Directors and Officers.
 
      Article VI of the Registrant's by-laws provides that a director or
officer shall be indemnified against expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement (provided such settlement is
approved in advance by the Registrant) in connection with certain actions,
suits or proceedings, whether civil, criminal, administrative or investigative
if he acted in good faith and in a manner he reasonably believed to be in or
not opposed to the best interests of the corporation, and, with respect to any
criminal action or proceeding, had no reasonable cause to believe his conduct
was unlawful. A similar standard of care is applicable in the case of
derivative actions, except that indemnification only extends to expenses
(including attorneys' fees) incurred in connection with the defense or
settlement of such an action, except that no person who has been adjudged to be
liable to the Registrant shall be entitled to indemnification unless a court
determines that despite such adjudication of liability but in view of all of
the circumstances of the case, the person seeking indemnification is fairly and
reasonably entitled to be indemnified for such expenses as the court deems
proper.
 
      Article 6.3 of the Registrant's by-laws further provides that directors
and officers are entitled to be paid by the Registrant the expenses incurred in
defending the proceedings specified above in advance of their final
disposition, provided that such payment will only be made upon delivery to the
Registrant by the indemnified party of an undertaking to repay all amounts so
advanced if it is ultimately determined that the person receiving such payments
is not entitled to be indemnified.
 
      Article 6.4 of the Registrant's by-laws provides that the right to
indemnification and the payment of expenses incurred in defending a proceeding
in advance of its final disposition conferred in the Article will not be
exclusive of any other right which any person may have or acquire under the by-
laws, or any statute or agreement or otherwise.
 
      Finally, Article 6.6 of the Registrant's by-laws provides that the
Registrant may maintain insurance, at its expense, to reimburse itself and
directors and officers of the Registrant and of its direct and indirect
subsidiaries against any expense, liability or loss, whether or not the
Registrant would have the power to indemnify such persons against such expense,
liability or loss under the provisions of Article VI of the by-laws. The
Registrant maintains and has such insurance in effect.
 
      Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Securities Act") may be permitted to directors, officers or
persons controlling the Registrant pursuant to the foregoing provisions, the
Registrant has been informed that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is therefore unenforceable.
 
                                      II-1
<PAGE>
 
Item 16. Exhibits.
 
<TABLE>   
<CAPTION>
 Exhibit
   No.   Description
 ------- -----------
 <C>     <S>
 4.1     --Securities Purchase Agreement./1/
         --Certificate of Designations, Preference and Rights of Series B
 4.2     Convertible Preferred Stock./1/
 4.3     --Registration Rights Agreement./1/
 5.1     --Opinion of Snow Becker Krauss P.C.*
 23.1    --Consent of Snow Becker Krauss P.C. (included in Exhibit 5.1).
 23.2    --Consent of BDO Seidman LLP, independent auditors.
</TABLE>    
- --------
/1/Incorporated by reference to the Registrant's Current Report on Form 8-K,
dated December 18, 1998.
* Previously filed.
       
Item 17. Undertakings.
 
(a) Rule 415 Offering
 
      The undersigned small business issuer hereby undertakes that it will:
 
(1)File, during any period in which it offers or sells securities, a post-
effective amendment to this registration statement to:
 
    (i) Include any prospectus required by section l0(a) (3) of the
        Securities Act.
 
    (ii) Reflect in the prospectus any facts or events which, individually
         or in the aggregate, represent a fundamental change in the
         information set forth in the registrant statement. Notwithstanding
         the foregoing, any increase or decrease in volume of securities
         offered (if the total dollar value of securities offered would not
         exceed that which was registered) and any deviation from the low or
         high end of the estimated maximum offering range may be reflected
         in the form of prospectus filed with the Commission pursuant to
         Rule 424(b) if, in the aggregate, the changes in volume and price
         represent no more than a 20% change in the maximum aggregate
         offering price set forth in the "Calculation of Registration Fee"
         table in the effective registration statement.
 
    (iii) Include any material information with respect to the plan of
          distribution not previously disclosed in the registration
          statement or any material change to such information in the
          registration statement.
 
(2)For determining any liability under the Securities Act, each such post-
effective amendment shall be deemed a new registration statement relating to
the securities offered therein, and the offering of such securities at that
time to be the initial bona fide offering thereof.
 
(3)Remove from registration by means of a post-effective amendment any of the
securities being registered that remain unsold at the termination of the
offering.
 
(e) Request for Acceleration of Effective Date
 
      Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Securities Act") may be permitted to directors, officers and
controlling persons of the small business issuer pursuant to the foregoing
provisions, or otherwise, the small business issuer has been advised that in
the opinion of the Securities and Exchange Commission such indemnification is
against public policy as expressed in the Securities Act and is, therefore,
unenforceable. In the event that a claim for indemnification against such
liabilities (other than the payment by the small business issuer of the
expenses incurred or paid by a director, officer, or controlling person of the
small business issuer in the successful defense of any action, suit or
 
                                     II-2
<PAGE>
 
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the small business issuer
will, unless in the opinion of its counsel the matter has been settled by
controlling precedent, submit to a court of appropriate jurisdiction the
question whether such indemnification by it is against public policy as
expressed in the Securities Act and will be governed by the final adjudication
of such issue.
 
                                      II-3
<PAGE>
 
                                   SIGNATURES
   
      Pursuant to the requirements of the Securities Act of 1933, the
Registrant certifies that it has reasonable grounds to believe that it meets
all of the requirements for filing on Form S-3 and has duly caused this
Amendment to the Registration Statement to be signed on its behalf by the
undersigned, hereunto duly authorized, in the City of Yonkers, State of New
York, on May 14, 1999     
 
                                          ENAMELON, INC.
 
                                          By /s/ Dr. Steven R. Fox
                                             ----------------------------------
                                                    Dr. Steven R. Fox
                                                 Chief Executive Officer
                                                      and Chairman
 
      Pursuant to the requirements of the Securities Act of 1933, this
Registration Statement has been signed by the following persons in the
capacities and on the dates stated:
 
                                   SIGNATURES
 
<TABLE>   
<CAPTION>
              Signature                              Title                       Date
              ---------                              -----                       ----
 
<S>                                    <C>                                <C>
        /s/ Dr. Steven R. Fox          Chairman of the Board of           May 14, 1999
 . ____________________________________  Directors and Chief Executive
          Dr. Steven R. Fox             Officer (Principal Executive
                                        Offier)
 
            /s/ Edwin Diaz             Treasurer, Vice President--        May 14, 1999
______________________________________  Finance and Chief Financial
              Edwin Diaz                Officer (Principal Financial
                                        Officer)
 
                   *                   Director                           May 14, 1999
______________________________________
          Dr. Bert D. Gaster
 
                   *                   Director                           May 14, 1999
______________________________________
         Richard A. Gotterer
 
                   *                   Director                           May 14, 1999
______________________________________
           Eric D. Horodas
 
                   *                   Director                           May 14, 1999
______________________________________
           Dr. S.N. Bhaskar
 
                   *                   Director                           May 14, 1999
______________________________________
          Walter W. Williams
 
   *By /s/ Dr. Steven R. Fox
          Dr. Steven R. Fox
           Attorney-in-fact
 
</TABLE>    
<PAGE>
 
                                 Exhibit Index
 
<TABLE>   
<CAPTION>
 Exhibit
   No.                             Description                             Page
 -------                           -----------                             ----
 <C>     <S>                                                               <C>
 4.1     --Securities Purchase Agreement./1/
         --Certificate of Designations, Preferences and Rights of Series
 4.2     B Convertible Preferred Stock./1/
 4.3     --Registration Rights Agreement./1/
 5.1     --Opinion of Snow Becker Krauss, P.C.*
 23.1    --Consent of Snow Becker Krauss P.C. (included in Exhibit 5.1).
 23.2    --Consent of BDO Seidman LLP, independent auditors.
</TABLE>    
- --------
/1/Incorporated by reference to the Registrant's Current Report on Form 8-K,
dated December 18, 1998.
*Previously filed.

<PAGE>
 
                                                                  
                                                               EXHIBIT 23.2     
                        
                     CONSENT OF INDEPENDENT CERTIFIED     
                               
                            PUBLIC ACCOUNTANTS     
   
      We hereby consent to the incorporation by reference in this Registration
Statement on Form S-3 of our report dated January 29, 1999, relating to the
consolidated financial statements of Enamelon, Inc. appearing in the Company's
Annual Report on Form 10-KSB for the year ended December 31, 1998.     
   
      We also consent to the reference to us under the caption "Experts" in
such Prospectus.     
                                                   
                                                /s/ BDO Seidman, LLP     
                                                   
                                                BDO Seidman, LLP     
   
Woodbridge, New Jersey     
   
May 14, 1999     


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