Align Technology To Hold Conference Call Santa Clara, Calif. - October 1, 2001 -- Align Technology, Inc. (Nasdaq: ALGN), the inventor of the Invisalign^® System today announced that it will hold a conference call Monday, October 1, 2001 to discuss the latest company developments which will include providing revenue guidance within the previously stated range for the third quarter of 2001 and to confirm operational integrity of its facilities in Lahore, Pakistan.

Align Technology will host the web cast and conference call today, Monday, October 1, 2001 at 5:00 p.m. EDT, 2:00 p.m. PDT. To access the web cast, go to the investor relations portion of Align Technology's website at www.invisalign.com . An archived web cast replay of the call will also be available at that website. To access the conference call please dial (415) 537-1965 approximately ten minutes prior to the start of the call and enter reservation number 19805711. If you are unable to listen to the call, a taped replay will also be available beginning approximately one hour after the call's conclusion and will remain available until 7:00 p.m. EDT on October 8, 2001. To access the taped replay, please dial (800) 633-8284 and enter reservation number 19805711. The replay may be accessed from international locations by dialing (858) 812-6440 and using the same reservation number.

This release may contain forward-looking statements based on Align Technology's current expectations. These forward-looking statements involve risks and uncertainties. A number of important factors could cause actual results to differ materially from those in the forward-looking statements. These factors include Align Technology's ability to maintain it's operations in Pakistan, achieve profitability, the ability to control costs and continue to achieve efficiencies, the adoption by orthodontists, dentists, and consumers of the Invisalign System, Align Technology's successful enforcement of its intellectual property and avoidance of infringement on third party patents, Align Technology's ability to establish and maintain reliable, high-volume manufacturing capacity in the U.S. and internationally and Align Technology's ability to manage its growth and retain its key personnel. These factors, as well as other factors that could cause actual results to differ materially, are discussed in more detail in Align Technology's Annual Report on Form 10-K, as well as other reports and documents filed from time to time with the Securities and Exchange Commission.