Fluoride enters the teeth in two ways; via the tooth surface or when it it swallowed. Topical fluoride, or that which is put onto the surface of your teeth, might be applied as in a varnish, toothpaste, or mouthwash.
In some cities, the tap water, naturally, has an optimal amount of fluoride; some don’t. Those that don’t, have it added to the tap water at .7 ppm. It is recommended that if you don’t have fluoride in your tap water, you should talk with your dentist regarding possible supplements.
Studies show that water fluoridation reduces cavities by at least 25% in children and adults. Everyone benefits from fluoride in the water even those who don’t have access to regular dental care. If we haven’t convinced you yet, it saves money, yes, $$$$! The cost for a lifetime of fluoridated water is less than the cost of one filling.
If you drink well water, you can have your water tested to see if it contains fluoride at a level that helps prevent decay or cavities. Contact your local health department for more information.
** statistics from ADA