[Evgeny]

Stephan Guyenet had a series of blog posts called "Malocclusion: Disease of Civilization" on dental health. As I remember, as usual, decline in dental health was linked to moving away from traditional diets. The problem with teeth "overcrowding" was linked, basically, to not chewing enough of tough foods. People that ate plenty of tough foods as part of their diets had better developed jaws and space enough for all their teeth.

http://wholehealthsource.blogspot.dk/search/label/dental%20h...

[amelius]

How about people who chew on gum all day?

[skummetmaelk]

As usual, too much of anything is bad for you. Chewing gum all day leads to many other (severe) issues.