Align Technology, Inc. Announces Date of its First Quarter 2003 Financial Results Conference Call Santa Clara, Calif. – April 4, 2003 -- Align Technology, Inc. (Nasdaq: ALGN), the inventor of Invisalign™, a proprietary method of straightening teeth without wires and brackets, today announced plans to release its first quarter 2003 financial results after the market closes on Thursday, April 24, 2003. The release will be available at the investor relations section of the company's website at www.invisalign.com.

On Thursday, April 24, 2003 at 4:15 pm. ET (1:15 pm PT), Thomas Prescott, president and chief executive officer, and Eldon Bullington, chief financial officer, will host a conference call to discuss the first quarter 2003 financial results. A question and answer session will follow.

To listen to the call, please dial (415) 537-1856 approximately ten minutes prior to the start of the call. 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 5:30 p.m. ET on May 8, 2003 and can be accessed by dialing (800) 633-8284 with reservation number 21139506. The replay may be accessed from international locations by dialing (402) 977-9140 using the same reservation number.