It is just unnatural - maybe not as bad as the old Chinese practice of footbinding, but the principle is the same.

There have always been people with imperfect teeth. Yet, up until a few decades ago, they could all walk, talk, chew gum, get married, raise children, make a living, and everything else while still having those imperfect teeth. Now, however, even if your children's teeth stick out only slightly, by God, you are neglectful and uncaring if you don't spend your last penny "taking care of the problem".

I have heard of children having all kinds of problems that just magically disappeared when the braces were removed for good.