The American Dental Association (ADA) is a professional organization for dentists and other dental professionals. It was founded in 1859 and is the world's largest and oldest national dental association. The ADA sets standards for dental care, promotes research, and provides resources for members. It also works to educate the public about oral health and cavity prevention. The ADA is responsible for approving materials used for cavity fillers, such as composite resins, amalgam, and glass ionomer cements.