I'm curious why only American skaters have braces in general. I can see Satoko has a retainer or some type of braces. Does Russia only choose beautiful girls who do not need braces? Is that a requirement for them? Or is the Western Dentistry just brace happy...
Another possibility is that non-Americans that get braces maybe tend to get removable braces (for example, InvisAlign in the U.S.), as opposed to the kind that are permanently stuck to teeth until they're removed. I don't know if this is likely though, because it seems like an expensive high-tech solution that Americans would be more likely to go for.
Or maybe it's just genetics. Or perhaps vodka promotes proper teeth alignment.