Print, Share, or View Spanish version of this article
fluoride (FLOR-eyed)—a natural chemical that helps teeth stay strong and helps prevent tooth decay. It hardens the outer coating on the teeth called enamel. Fluoride also helps repair early damage to teeth.
permanent (PUR-muh-nint)—lasting for a lifetime. Permanent teeth replace baby teeth one by one in your child's mouth. If your child loses a permanent tooth, it won't grow back.