Community water fluoridation has been recognized by the US CDC as one of the 10 great public health achievements in the 20th century. Fluoridated water has been shown to be a safe, inexpensive and effective method of preventing tooth decay. Community water fluoridation provides benefits to everyone in the community. Fluoridation reduces tooth decay by about 25% over a person’s lifetime. Every dollar spent on community water fluoridation saves at least $38 in costs for dental treatment.