Before the advent of farming, our jaws were larger; our faces were broader, our teeth were straight, we had adequate room for our wisdom teeth, larger brains, and more space in our throats to breathe. It is a virtual certainty that our changing diets contributed to crooked teeth and a lack of adequate space for wisdom teeth and constricted airways. SMALL JAWS CAUSE BIG PROBLEMS. Heart disease, cancer, Alzheimer's disease, ADHD, depression, and anxiety are a few. In this post, I am going to cover how our lifestyles have changed leading to our current problems, and what we can do about it.