The American Dental Association (ADA) is an organization that promotes the health of teeth and gums through research, education, and advocacy. It is the largest and oldest national dental association in the world, and it sets standards for dentists and dental hygienists. The ADA also provides resources to help people find a dentist and understand their dental insurance coverage. The ADA's mission is to improve the oral health of the public and to promote the art and science of dentistry.