Align Technology, Inc. Announces Date of its Third Quarter 2004 Financial Results Conference CalSANTA CLARA, Calif., Sept. 30 /PRNewswire-FirstCall/ -- 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 third quarter 2004 financial results before the market opens on Thursday, October 21, 2004. The release will be available on the Investor Relations section of the company's web site at www.aligntechcom.

On Thursday, October 21, 2004 at 10:00 a.m. EDT (7:00 a.m. PDT), Thomas M. Prescott, President and Chief Executive Officer, and Eldon M. Bullington, Chief Financial Officer, will host a conference call and web cast to review third quarter 2004 financial results.

To access the web cast, go to "Conference Calls" in the Investor Relations section of Align Technology's website at http://www.aligntech.com/generalapp/us/en/corporate/investor_frameset.jsp . To access the conference call, please dial 201-689-8341 approximately ten minutes prior to the start of the call. If you are unable to listen to the call, an archived web cast will be available beginning approximately one hour after the call's conclusion and will remain available through 5:30 p.m. EDT on October 20, 2005. Additionally, a telephonic replay of the call can be accessed by dialing 877-660-6853 with account number 292 followed by # and conference number 119689 followed by #. The replay may be accessed from international locations by dialing 201-612-7415 and using the same account and conference numbers referenced above. The telephonic replay will be available through 5:30 p.m. EST on November 5, 2004.

About Align Technology, Inc.

Align Technology designs, manufactures and markets Invisalign, a proprietary method for treating malocclusion, or the misalignment of teeth. Invisalign 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, Invisalign significantly reduces the aesthetic and other limitations associated with braces. Invisalign is appropriate for treating adults and older teens. Align Technology was founded in March 1997 and received FDA clearance to market Invisalign in 1998.

To learn more about Invisalign or to find a certified Invisalign doctor, please visit www.invisalign.com or call 1-800-INVISIBLE.

    Investor Relations Contact              Press Contact:
     Barbara Domingo                         Shannon Henderson
     Align Technology, Inc.                  Ethos Communications, Inc.
     408-470-1000                            678-417-1767
     investorinfo@aligntech.com              shannon@ethoscommunication.com

SOURCE Align Technology, Inc.

09/30/2004

CONTACT: Barbara Domingo of Align Technology, Inc., +1-408-470-1000, or investorinfo@aligntech.com; or Shannon Henderson of Ethos Communications, Inc., +1-678-417-1767, or shannon@ethoscommunication.com, for Align Technology, Inc. Web site: http://www.invisalign.com