I recently the book, Consider the Fork, a history of invention in the kitchen by Bee Wilson. Most interesting was the evolution of our teeth in relation to the invention of eating utensils. Archaeological findings indicate the necessity of chewing for survival and the evidence is with the Chinese who developed superior knifes long before western civilization so their jaws evolved with an overbite nearly 1,000 years earlier than Western Civilization.  The overbite which is normal today is compared to the edge-to-edge bite. What changed was the adoption of the knife and fork, cutting food into small morsels before eating it. Christy