Because some insurance plans don’t cover the cost of fluoride treatments for patients older than 13 or 14 years, parents have to decide if they want to pay for the treatment out-of-pocket. Therefore, some parents come to me asking these questions: Is it necessary to apply it? Is it good? Is it worth it? What is it? Fluoride is an element of the halogen group that has a great capacity of chemical reaction. Therefore, in the presence of calcium and phosphate on oral cavity, Fluorapatita is formed on the surface of teeth, which strengthens mineralization and hardens the tooth enamel. Fluorine is the gel which is applied after cleanings. I joke with my patients by telling them that we are going to apply "the vitamin" because it is part of a therapy to help prevent cavities. Since the Fluoride has the following two basic mechanisms of protective action against caries: Low level of fluoride inhibits dental caries by affecting the metabolic activity of cariogenic bacteria and e