Something I've chatted to about with fellow UK folk occasionally (insert joke about "English teeth" here) is how, from our perspective some USA folk's teeth seem to cross the uncanny valley in the wrong direction.
They're so white and so even they look false to our eyes.
Define 'crooked" ;) I certainly see kids in the EU with teeth that would be "corrected" in the US. I get the impression that the aesthetics vs clinical need / risk line is drawn differently.
Many of the celebrities that you see from the US actually have porcelain veneers put in, so you're not even actually seeing real teeth. Perhaps this is the kind of teeth that creep you out?
They're so white and so even they look false to our eyes.