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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

        We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-55020, No. 333-82874, No. 333-116912, No. 333-125586) of Align Technology, Inc. of our report dated February 26, 2008, relating to the financial statements, financial statement schedule, and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/PricewaterhouseCoopers LLP
San Jose, California
February 26, 2008

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Exhibit 23.1