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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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I'm guessing you brush twice a day or aspire to.

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Our ancestors were a little less diligent.

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But that's a good thing for scientists.

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Because ancient, plaque-coated teeth are like time capsules, preserving early evidence of cavities or even plague DNA.

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Now researchers have turned to thousand-year-old teeth from a convent cemetery outside Frankfurt, Germany.

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And they cleaned 'em, much like your dentist does.

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"We used the same dental tools, and collected the calculus from the teeth."

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That's molecular anthropologist Christina Warinner of the University of Oklahoma.

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Inside that calculus or plaque, she and her colleagues found tiny bits of pork, bread wheat and cabbage, identified by their DNA.

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Along with the bugs behind strep throat, bacterial meningitis and an oral strain of gonorrhea.

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And don't be too quick to judge.

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"Nearly all of us still have gonorrhea in our mouth."

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Their study is in the journal Nature Genetics.

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Some of those bugs were antibiotic resistant too.

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Because long before penicillin, some microbes produced natural antibiotics to attack rivals.

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"Your mouth is like a battlefield of bacteria."

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So chew on that.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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