The mineral fluoride has been proven to be significant in the prevention of tooth decay: a form of infection caused by bacteria. Fluoride is an effective treatment when administered systemically or applied topically. Over 70% of the water supplies in the United States contain minute quantities of fluoride. The fluoridated water provides the systemic advantages of fluoride for all who drink it. Fluoride can also be topically applied to teeth by your dental professionals.
While fluoride has been proven to help repair teeth that are modestly infected, it is primarily considered a preventive measure.