Got a mouthful of metal and stack of orthodontic bills? You can thank your farmer ancestors for them.
That's according to an anthropologist who says the switch from chewing wild game to eating corn, rice and wheat could have shortened the human jaw so that teeth don't fit in it as well.
When agriculture took off in some parts of the world, it had a lot to offer people: Farmed foods are a more reliable source of calories, and are easier to chew and digest. But they also may have helped transform the jaw bone before the teeth could catch up.
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