A huge number of children and adults around the world have bite problems, and these issues are not only aesthetic—they can lead to serious diseases. In this book, dentist Sandra Kahn and Paul R. Ehrlich, a renowned biologist, examine the causes and consequences of improper jaw development in modern people, as well as present a new perspective on orthodontics and dental treatment. In their view, inadequate jaw development can cause sleep apnea, breathing difficulties, heart problems, depression, and other dangerous conditions. The authors encourage readers to pay attention to how you breathe, chew, and sleep, in order to form healthier habits and make your life better.