What is Fluoride and Fluoridation? Fluoride is a substance that protects the teeth and helps prevent tooth decay. Fluoride can be found in toothpaste and even tap water. Fluoridation plays a protective role against dental decay throughout life, benefiting not only children but also adults. Because older adults experience more problems with gum recession, the risk of root decay increases with age. • Studies demonstrate that the topical effect of fluoride in an adult’s mouth du