What the curious skeptic can verify on themselves and their family is this: look at photographs of your grandparents at the age you are now. Look at your parents. Look at yourself. Look at your children. In most families, the progression is visible. The grandparents have broader faces, fuller jaws, teeth that — though often worn — sit in arches that accommodated them without orthodontic intervention. The grandchildren have narrower faces, crowded teeth that required braces, palates so high and constricted that the tongue cannot rest where it belongs.