I have noticed that Americans generally have far better teeth than the British do, what are they having done?

I'm going to be going to the US soon and would like to have aesthetic work done as it is cheaper than over here in the UK. I have already had braces and whitening, but they still do not look perfect. What are some common procedures Americans have done to perfect their teeth?

Help appreciated, thanks!
I have noticed that Americans generally have far better teeth than the British do, what are they having done?
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