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This is Scientific American 60-Second Health. I'm Dina Fine Maron. Got a minute?

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Ouch! About a quarter of all school-age kids will break or otherwise damage a tooth.

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Adults have their share of cracked chompers too.

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But what if fixing a busted bicuspid was as easy as zapping it with a laser?

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Preliminary work with young rats has moved dentistry a small step in that direction.

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A new study finds that shining a low-power laser on damaged rat teeth activates molecular growth factors already present in the tissue.

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These growth factors cue stem cells to generate dentin, the bone-like substance that teeth are mostly made of.

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Researchers also found that when mice were missing those growth factors,

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or when the factors were blocked from working, the stem cells would not regenerate dentin when exposed to laser light.

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That finding confirms the important role these signaling pathways play in dental development.

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The study, led by David Mooney at Harvard's Wyss Institute, is in the journal Science Translational Medicine.

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Could a light-based treatment for cavities and chipped teeth eventually be in the offing for people?

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Researchers plan to investigate that possibility for human teeth, both baby and adult.

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But until then, chew carefully.

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And don't lead with your chin.

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Thanks for the minute, for Scientific American 60-Second Health. I'm Dina Fine Maron.

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