... the lower jaw reflects whether populations are primarily hunter-gatherer or agriculturalist in nature, irrespective of what part of the world they come from. This therefore suggests that chewing behaviour causes the lower jaw to grow and develop differently in different subsistence groups, while the skull is not affected in the same way.
Overall, the hunter-gather groups had longer and narrower mandible, indicating more room for the teeth to erupt correctly, while the agriculturalists had generally shorter and broader mandibles, increasing the likelihood of dental crowding.
However it must be noted that the first known case of impacted wisdom tooth happened in a Magdalenian forager. Magdalenian people in general had quite narrow, modern, jaws, like Chancelade Man (right), so it may be a more complex matter, specially as meat, cereals and other foods can be cooked in many different ways, regardless of economical paradigm.