The public health policies we benefit from today are built upon a strong base of scientific evidence. The overwhelming weight of the evidence indicates that water fluoridation at the levels practiced in the United States is safe and effective at helping prevent tooth decay. The American Dental Association, American Academy of Pediatric Dentistry, and American Academy of Pediatrics are just a few of the more than 125 organizations that recognize the public health benefits of water fluoridation. The U.S. Centers for Disease Control has named water fluoridation one of ten great public health achievements of the 20th century.