Answer: This is tricky because I'm sure I haven't discovered them all yet. But there does seem to be a belief that we are "obsessed with teeth." It probably does seem that way from here, where it appears that people don't actually use dentists. (Just kidding.) Most Americans are not obsessed with teeth. Also, we don't all own guns. In spite of the huge number of guns in my country, I know a lot of people who don't own a single gun. In my immediate circle of friends, probably not a single one owns a gun.
I'm looking forward to questions about other misconceptions/stereotypes that I might debunk (or confirm!)