Description: The AAO is a professional member association of educationally qualified orthodontic specialists dedicated to ethically advancing the art and science of orthodontics, improving the health of the public by promoting quality orthodontic care, and supporting the practice of orthodontics. The AAO is comprised of more than 19,000 members in the United States, Canada and abroad. The specialty of orthodontics is the oldest and largest dental specialty recognized by the American Dental Association.