You know that brushing your teeth is a must for maintaining a healthy smile, but how much do you actually know about your toothpaste? Find out what's true - and what's not - so that you can keep your teeth in mint condition. Reality: Experts used to think that fluoride only strengthened teeth while they were developing, but "studies now show that topical fluoride - the kind in toothpastes, mouth rinses, and fluoride treatment - helps fight decay in people of all ages," says Marc Lowenberg, DDS, a dentist at Lownberg, Lituchy & Kantor in New York City.
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