Bleaching, braces, veneers, and genetics. I have no idea if there is a genetic difference in the US, but according to Wikipedia, it seems modern toothpaste fir

Bleaching, braces, veneers, and genetics. I have no idea if there is a genetic difference in the US, but according to Wikipedia, it seems modern toothpaste first took hold in America. Colgate, a US company, introduced modern toothpaste in 1873. Later, toothpaste that had been developed by researchers in the UK and US, did not find commercial success in the UK, and they focused on the US where it took off. This suggests that the US were more interested in the appearance of their teeth. https://en.wikipedia.org/wiki/Toothpaste#:~:text=Pre%2Dmixed%20toothpastes%20were%20first,powder%20until%20World%20War%20I https://en.wikipedia.org/wiki/Toothpaste#:~:text=Pre%2Dmixed....