Fluoride is a mineral used to help prevent caries and help harden enamel. Fluoride is found naturally in water and in many foods, and it is also used to help with the remineralization process to prevent breakdown of the tooth and tooth decay. Today, studies have shown that drinking fluoridated water has decreased dental caries by two-thirds. Brushing with fluoridated toothpaste and using community fluoridated water is considered to be helpful in decreasing decay. In areas where the water supply is not fluoridated, fluoride treatments may be prescribed to children.