In the past young women from poor families had all their teeth taken out and replaced by dentures as a 21st birthday present.
(These were sometimes presented to the man of their dreams as a sort of dowry. I guess the idea being that the woman wouldn’t cost anything in dental bills, or maybe the teeth could be sold so that well to do people could have dentures. This kind of thinking continued into the twentieth century, when having dentures was still a bit of a status symbol.
Of course nowadays people will do anything to get that perfect white smile, I’m sure there will be equal astonishment in the future when someone reads about how people would bleach their teeth in the twenty-first century.)