Fluoride is one of the best ways to help prevent against tooth decay. A naturally occurring mineral, fluoride combines with the tooth’s enamel to strengthen it. In many municipal water supplies, the right amount of fluoride is added for proper tooth development. To find out whether your water contains fluoride, and how much, call your local water district. If your water supply does not contain any (or enough) fluoride, your child’s pediatrician or dentist may suggest using fluoride drops or a mouth-rinse in addition to a fluoride toothpaste.