You already have fluoride in your body, as it is one of the vital trace elements found in bones and teeth. Fluoride contains fluorine, which helps protect against tooth decay.
How does fluoride protect against cavities?
Fluoride binds to tooth enamel, where it forms a protective layer. This prevents bacteria from reaching the teeth and thus they become more resistant. This whole process is called remineralisation. But that’s not all. Fluoride also slows the growth of bacteria and fights against acids that enter the mouth from food and drink. It can even stop tooth decay in its infancy.