What invention led to a rise in crooked teeth?

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Agriculture is why so many people need braces. Braces have become so commonplace in the U.S. that wearing them is almost a rite of passage; data suggests that about 50% of children in the U.S. will need orthodontic treatment at some point, mostly due to misaligned teeth. But that wasn't always the case. The advent of agriculture changed the human diet, which led to a smaller jaw that no longer has enough space to provide a comfy home for all 32 teeth. Before humans took to the plow around 10,000 BCE, our hunter-gatherer predecessors chowed down on tougher foods, such as uncooked vegetables and hard-shelled nuts, and needed bigger, stronger jaws to munch through them. When farming introduced softer foods into our diet, such as beans and cereals, the need for those beefy jaws declined. Our jaws got smaller over the generations, but human teeth shrank at a much slower rate, resulting in the dental traffic jam experienced by millions of Americans every year.

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