The American Academy of Periodontology (AAP) is an 8,200-member professional organization for periodontists - specialists in the prevention, diagnosis, and treatment of diseases affecting the gums and supporting structures of the teeth, and in the placement of dental implants. Periodontists are also dentistry's experts in the treatment of oral inflammation and receive three additional years of specialized training following dental school. Periodontics is one of the nine dental specialties recognized by the American Dental Association.