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This plant brushed ancient peoples' teeth

"Cyperus rotundus in Kadavoor" © 2009 Jeevan Jose, Kerala, India is used here under a Creative Commons Attribution-ShareAlike 4.0 International License [CC-BY-SA-4.0], via Wikimedia Commons

This plant brushed ancient peoples' teeth

A plant that’s been dubbed the “world’s worst weed” may not be entirely bad. Researchers have learned that 2000 years ago people ate purple nutsedge, unknowingly cleaning their teeth at the same time, National Geographic reports. After analyzing the teeth of people in an ancient Sudanese graveyard, archaeologists found that less than 1% had cavities. Their results, published this week in PLOS ONE, suggest the weed can impede the growth of bacteria associated with tooth decay.

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