The Surprising Reason Why Human Teeth Are A Design Disaster - Cheddar Explains https://www. youtube.com/watch?v=PzYLSPY5yFw minute 6:00 soft cooked foods versus raw Lieberman showed that "higher chewing strains resulted in more bone that anchors the teeth" Lieberman proved that the ultimate length of the jaw depends upon the chewing stress during childhood. It not our teeth that are too big for our mouths its our jaws that are too small. Min 9:00 feeding kids tough raw food will simulate their their jaw bones to grow more and better fit their teeth and a lack of sugar will cause less cavities.