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1 .This is Scientific American 60-Second Science. I'm Cynthia Graber.This'll just take a minute.
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2 .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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3 .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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4 .Now research shows that at least some pre-agricultural humans also had a bad case of tooth decay.
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5 .The study is in the Proceedings of the National Academy of Sciences.
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6 .One hunter–gatherer site in Morocco called Grotte de Pigeons was a key ritual and economic center.
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7 .The deposits there date to some 15 thousand years ago and are incredibly dry.
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8 .So organic material, including bones and charred plant remains, are well-preserved.
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9 .Researchers found leftover pine nuts, juniper, pistachio, wild oats, and particularly popular carbohydrate-rich acorns.
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10 .Eaten raw or as flour, acorns can stick in teeth.
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11 .The foodstuff makes a happy home for acid-loving bacteria that cause cavities.
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12 .The scientists also analyzed teeth from 52 partial or complete jaws.
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13 .They found that more than half the teeth showed signs of lesions.
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14 .And only three of the adults were cavity-free.
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15 .Thousands of years before folks in the area learned to farm.
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16 .Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.
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