Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Invisalign is a series of clear, removable teeth aligners that both orthodontists and dentists use as an alternative to traditional metal dental braces. As of April 2008, more than 730,000 patients have completed or are currently in treatment. Invisalign is designed, manufactured, and marketed by Santa Clara-based medical-device company Align Technology, Inc. Align says that over 35,790 doctors are trained to provide Invisalign treatment in the U.S., with 48,130 doctors worldwide. As of January 29, 2008, Align Technology has 1,307 employees worldwide, and has manufactured more than 32 million aligners. The company has 133 patents.