Back in my first dot-com-boom days of SF living when I still was acting like I knew what I was doing ... I was living in a rented room in a huge 4 bedroom place on the top of Noe Valley. Nice view if you can get it.
The owner was five years younger than me, but he was a finance guy. It was a super nice place. I stuck out. One, because everyone else that lived there was super-fancy Ivy league, private secondary school, and well traveled, well spoken, and well dressed. And two, they were all, by their own admission, ABCD, which left us with two bits of an demographic rift to cross for most everything.
One day Neil swore to me that the secret to good teeth was a tongue cleaner.
"FACT," he said. "South Asians (did he use the word Gujarati?) were used most often as medical skeletons because of the completeness of their teeth as a population he informed me arms folded triumphantly.
Which, he continued, was because of the consistent and near total usage of the tongue cleaner by South Asians. I still haven't picked one up though.