Fluoride is a natural mineral that builds strong teeth and  help stop the decay from penetrating into the deeper parts of teeth  . It supports healthy tooth enamel and fights the bacteria that harm teeth and gums. Dentists provide professionally more fluoride than what is there in your water, toothpaste or diet.It works by restoring minerals to tooth surfaces where bacteria may have eroded the enamel. It can also inhibit the growth of harmful oral bacteria and further prevent cavities. Flouride application in a dental clinic takes just few minutes but you have to avoid eating or drinking for atleast 30 minutes after the treatment so the fluoride can be fully absorbed.