Santa Clara, Calif. - October 29, 2001 -- Align Technology, Inc. (Nasdaq: ALGN), Align Technology, Inc. (NASDAQ: ALGN), manufacturers of the Invisalign^® System, a proprietary method of straightening teeth without unsightly wires and brackets, today announced a sold-out crowd for the first annual Invisalign Summit Meeting 2001. The conference offers Invisalign-certified orthodontists a chance to share their experiences and learn more about Invisalign treatment options in a peer-to-peer setting.

The sold out event commences Friday, November 2nd at the Venetian Hotel in Las Vegas, Nevada. Over 500 top orthodontist customers and their staffs from across the United States and Canada will attend the meeting to share tips, techniques and advances in the Invisalign technology.

"This sell-out crowd is a testament to the excitement generated by Invisalign," said Zia Chishti, chief executive officer of Align Technology. "By coming together to share knowledge and learn more, these doctors are not only continuing to offer their patients the most up-to-date treatment options, but they're building on the enthusiasm Invisalign has brought to the industry."

About Align Technology

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. Invisalign 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.

This release may contain forward-looking statements based on Align Technology's current expectations. These statements include, but are not limited to, statements addressing the attendance at the conference. 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 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 significant 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.