The WFO was formed at the 4th International Orthodontic Congress (IOC) in San Francisco by 69 affiliated organizations on May 15, 1995 and now has over 8000 WFO fellows and 109 affiliated organizations.

Founded in 1900, the American Association of Orthodontists (AAO) is the world’s oldest and largest dental specialty organization. It represents more than 17,000 orthodontist members throughout the United States, Canada and abroad.