When people who lack fluoride in their water supply are provided with the ideal amount, the incidence of tooth decay drops by as much as 65 percent.
وهذا المركَّب ،‏ الذي يوجد طبيعيا في مخزون المياه عادة ،‏ هو احد مكوِّنات ميناء الاسنان .‏