EXHIBIT 5.1

                   Opinion of Brobeck, Phleger & Harrison LLP

                                  June 3, 2002

BioLase Technology, Inc.
981 Calle Amanecer
San Clemente, California 92673

         Re:  BioLase Technology, Inc.  Registration Statement on Form S-3
              for the Resale of 944,100 Shares of Common Stock
              --------------------------------------------------------------

Ladies and Gentlemen:

         We have acted as counsel to BioLase Technology, Inc., a Delaware
corporation (the "Company"), in connection with the registration for resale of
up to an aggregate of 221,600 shares of the Company's common stock (the
"Shares") and 722,500 shares of the Company's common stock issuable upon the
exercise of certain warrants dated March 22, 2000, December 1, 2000 and May 1,
2001 (the "Warrant Shares"), pursuant to the Company's Registration Statement on
Form S-3 (the "Registration Statement") filed with the Securities and Exchange
Commission under the Securities Act of 1933, as amended (the "Act").

         This opinion is being furnished in accordance with the requirements of
Item 16 of Form S-3 and Item 601(b)(5)(i) of Regulation S-K.

         We have reviewed the Company's charter documents, the corporate
proceedings taken by the Company in connection with the original issuance and
sale of the Shares and a certificate of a Company officer regarding, among other
things, the Company's receipt of consideration upon the original issuance and
sale of the Shares. Based on such review, we are of the opinion that the Shares
are duly authorized, validly issued, nonassessable and, to our knowledge, fully
paid, and that if, as and when the Warrant Shares are issued and sold (and the
consideration therefor received) pursuant to the provisions of the underlying
warrants, such Warrant Shares will be duly authorized, validly issued, fully
paid and nonassessable.

         We consent to the filing of this opinion letter as Exhibit 5.1 to the
Registration Statement and to the reference to this firm under the caption
"Legal Matters" in the prospectus which is part of the Registration Statement.
In giving this consent, we do not thereby admit that we are within the category
of persons whose consent is required under Section 7 of the Act, the rules and
regulations of the Securities and Exchange Commission promulgated thereunder or
Item 509 of Regulation S-K.



         This opinion letter is rendered as of the date first written above and
we disclaim any obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinion expressed herein. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Company, the
Shares or the Warrant Shares.

                                              Very truly yours,


                                              Brobeck, Phleger & Harrison LLP