Wait. What?

It is a fact cavemen had relatively straight teeth and that crooked teeth are a modern phenomenon.

A comparison of 146 medieval skulls from abandoned Norwegian graveyards with modern skulls indicated a trend toward bad bite in our more recent forebears. The skulls of people scored as being in “great” or “obvious” need of orthodontic treatment made up 36 percent of the medieval sample and 65 percent of the modern sample.