Fluoride is a mineral that occurs naturally in many foods and water. Every day, minerals are added to and lost from a tooth's enamel layer through two processes, demineralization and demineralization. Minerals are lost from a tooth's enamel layer when acids-formed from plaque bacteria and sugars in the mouth attack the enamel. Minerals such as fluoride, calcium, and phosphates are redeposited to the enamel layer from the food and water consumed. To much demineralization without enough demineralization to repair the enamel layer leads to tooth decay.
Dr. James L. Johnson