Why Are Human Teeth So Messed Up? (2017)

In other words, the sizes of Hadza teeth and jaws match perfectly. In this way, diet determines how well jaw length matches tooth size. The dental anthropologist Robert Corruccini at Southern Illinois University has seen the effects by comparing urban dwellers and rural peoples in and around the city of Chandigarh in northern India—soft breads and mashed lentils on the one hand, coarse millet and tough vegetables on the other.

Source: www.sapiens.org