The Brits have better average tooth health than Americans. They don't go for orthodontia as frequently, but in terms of cavities and missing teeth, they do better.

This is largely explained by economic differences in the US. The poor have awful tooth health; the wealthy have very good tooth health. In the UK, the poor and wealthy are closer to the median.

https://www.cnn.com/2015/12/17/health/british-american-bad-t...

It might be part of the explanation, but I think it's also cultural. People just don't care about good teeth here the same way that they seem to in the US. Or rather: they have a different idea of what good teeth are. If your teeth are actually black or rotting or missing, then that's seen as bad. But a little crooked or yellow is mostly seen as normal.

It appears that the obesity rate in the UK is about 30%, whereas in the US it's around 40%. For historical context, it seems that the US was at about 30% roughly around 2000.

So I guess that the US is fatter, but the UK is still one of the fattest countries in the world. The BBC claims the UK is getting fatter faster than the US too.

https://www.bbc.com/news/uk-41953530

http://www.oecd.org/unitedkingdom/Health-at-a-Glance-2017-Ke...

Teeth are probably a myth. People see Americans on TV, of course they do extreme things to make them blindingly white.

This seems a little cliche. Personally I find the brilliant white beacons people have in their mouth in the states a little unsettling. Teeth aren’t naturally a beaming snow white - they’re bone coloured.