toothpaste?as soon as they appear. The new recommendations also change the advice for older kids: Children should keep using a smear — not the pea-sized amount previously recommended — until their third birthday. Children between ages 3 and 6 should use a pea-sized amount of fluoride toothpaste,
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.
Fluoride works to prevent cavities by rebuilding teeth. Highly reactive fluoride sticks to molecules in the tooth that become exposed when bacteria-produced acid attacks the teeth,
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. Fluoride molecules latch on to the tooth and beckon other minerals such as calcium and phosphate in a process called remineralization,
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.
Fluoride’s main anticavity superpowers come from topical application to the tooth surface — exactly the situation when fluoridated toothpaste is used. When fluoride is ingested,
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, the levels of the entire body are raised. The resulting fluoride-rich saliva bathes the teeth and allows remineralization.
Scientists know this process works in adults. There aren’t good studies on fluoride cavity prevention in young children,
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, but presumably, fluoride has a similar protective effect, Wright says. “There are always gaps in our knowledge,” Wright says. But there’s enough evidence out there to convince him the new guidelines will help prevent cavities and fluorosis, too,
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, he says.
The ideal fluoride level that prevents cavities but has no ill effects is about 0.05 milligrams per kilogram of body weight per day. (That limit is probably debatable,
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, especially for small children,
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, but that’s another post.) In the updated guidelines, the ADA calculates kids’

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