Exhibit 5

                               January 31, 2001


Align Technology, Inc.
851 Martin Avenue
Santa Clara, CA 95050


          Re:  Align Technology, Inc. Registration Statement on Form S-8
               for 13,671,362 Shares of Common Stock

Ladies and Gentlemen:

          We have acted as counsel to Align Technology, Inc., a Delaware
corporation (the "Company"), in connection with the registration on Form S-8
(the "Registration Statement") under the Securities Act of 1933, as amended, of
13,671,362 shares of common stock (the "Shares") authorized for issuance under
the Company's Employee Stock Purchase Plan and the 2001 Stock Incentive Plan
(collectively, the "Plans").

          This opinion is being furnished in accordance with the requirements of
Item 8 of Form S-8 and Item 601(b)(5)(i) of Regulation S-K.

          We have reviewed the Company's charter documents and the corporate
proceedings taken by the Company in connection with the establishment of the
Plans.  Based on such review, we are of the opinion that, if, as and when the
Shares have been issued and sold (and consideration therefor received) pursuant
to (a) the provisions of option agreements or stock purchase rights duly
authorized under the Plans and in accordance with the Registration Statement, or
(b) duly authorized direct stock issuances under the 2001 Stock Incentive Plan
and in accordance with the Registration Statement, such Shares will be duly
authorized, legally issued, fully paid and nonassessable.

          We consent to the filing of this opinion letter as Exhibit 5 to the
Registration Statement.

          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
Plans or the Shares.



                                             Very truly yours,

                                             /S/ BROBECK, PHLEGER & HARRISON LLP

                                             BROBECK, PHLEGER & HARRISON LLP