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This is Scientific American 60-Second Science. I'm Cynthia Graber.This'll just take a minute.

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The warm, moist environment of your mouth makes it a great place for bacteria, some of which keep busy causing cavities.

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Such dental difficulty was thought to have really taken off when we switched from hunting-gathering to agriculture and had a ready supply of farmed, fermentable carbohydrates.

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Now research shows that at least some pre-agricultural humans also had a bad case of tooth decay.

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The study is in the Proceedings of the National Academy of Sciences.

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One hunter–gatherer site in Morocco called Grotte de Pigeons was a key ritual and economic center.

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The deposits there date to some 15 thousand years ago and are incredibly dry.

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So organic material, including bones and charred plant remains, are well-preserved.

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Researchers found leftover pine nuts, juniper, pistachio, wild oats, and particularly popular carbohydrate-rich acorns.

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Eaten raw or as flour, acorns can stick in teeth.

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The foodstuff makes a happy home for acid-loving bacteria that cause cavities.

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The scientists also analyzed teeth from 52 partial or complete jaws.

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They found that more than half the teeth showed signs of lesions.

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And only three of the adults were cavity-free.

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Thousands of years before folks in the area learned to farm.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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