Fluoride is a mineral that helps to strengthen teeth and prevent cavities. It is found in many toothpastes, mouthwashes, and dental treatments. Dentists apply fluoride to teeth as a way to help protect them from decay.
Fluoride works by strengthening the tooth's enamel, which is the hard outer layer of the tooth. Enamel is made up of minerals, including calcium and phosphate. Fluoride helps to replace these minerals and make the enamel more resistant to acids. Acids can damage enamel and lead to cavities.