"Founded in 1859, the American Dental Association is the oldest and largest national dental society in the world. Since then, the ADA has grown to become the leadingsource of oral health related information for dentists and their patients. There are over 157,000 ADA members from all 50 states, the District of Columbia and Puerto Rico. The ADA is a member-run organization managed by an elected Board of Trustees and a 473-member House of Delegates."