Align Technology, Inc. Announces First Fiscal Quarter 2001 Conference Call Santa Clara, Calif. – April 17, 2001 -- Align Technology, Inc. (Nasdaq: ALGN), the inventor of the Invisalignâ System, a proprietary method of straightening teeth without unsightly wires and brackets, today announced plans to release its first fiscal quarter 2001 financial results before the open of the market on Thursday, April 26, 2001. The earnings release will be available on the investor relations portion of the company’s website at www.invisalign.com. On Thursday, April 26, 2001 at 9:00 a.m. EDT or 6:00 a.m. PDT, Zia Chishti, chief executive officer, and Steve Bonelli, chief financial officer, will host a conference call to discuss the first fiscal quarter 2001 financial results. A question and answer session will follow.

To listen to the call, please dial (415) 537-1802 approximately ten minutes prior to the start of the call and enter reservation number 18581642. 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 through 11:00 a.m. EDT on May 3, 2001 and can be accessed by dialing 800-633-8284 with reservation number 18581642. The replay may be accessed from international locations by dialing 858-812-6440 using the same reservation number.

Additionally, the conference call will be broadcast live over the Internet and can be accessed through the investor relations portion of Align’s website at www.invisalign.com. Please access the website at least fifteen minutes prior to the start of the call to register, download, and install any necessary audio software. An archived webcast replay of the call will also be available at www.invisalign.com.

About Align Technology, Inc. Align Technology designs, manufactures and markets the Invisalign System, a proprietary new method for treating malocclusion, or the misalignment of teeth. The Invisalign System corrects malocclusion using a series of clear, nearly invisible, removable appliances that gently move teeth to a desired final position. Because it does not rely on the use of metal or ceramic brackets and wires, the Invisalign System significantly reduces the aesthetic and other limitations associated with braces. The Invisalign System is appropriate for treating adults and older teens. Align Technology was founded in March 1997 and received FDA clearance to market the Invisalign System in 1998.

The foregoing information represents Align Technology’s outlook only as of the date of this press release, and Align undertakes no obligation to update or revise any forward-looking statement, whether as a result of new developments or otherwise.

CONTACT: Mary Magnani of Thomson Financial/Carson, 415-617-2542, or mary.magnani@tfn.com Danielle Scheg of Thomson Financial/Carson, 415-617-2541, or danielle.scheg@tfn.com