Fluoride is beneficial to teeth because it helps to:
rebuild (remineralize) weakened tooth enamel
slow down the loss of minerals from tooth enamel
reverse early signs of tooch decay.
prevent the growth of harmful oral bacteria
When bacteria in your mouth break down sugar and carbs, they produce acids that eat away at the minerals in your tooth enamel. This loss of minerals is called demineralization. Weakened tooth enamel leaves your teeth vulnerable to bacteria that cause cavities.
Fluoride helps to remineralize your tooth enamel, which can prevent cavities and reverse early signs of tooth decay.