Why do teeth don't regenerate?
Seems pretty dumb in our biological design to not be able to regenerate such a functional (and also easily breakable) part of our body.
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There are VERY few circumstances in nature where someone in nature who gets all their teeth knocked out is gonna survive long enough to reproduce
You said it.
In nature.
"Population pressure and the stress of modern life may cause an increase in violent tendencies. The urban environment is the incubator for all sorts of undesirable behaviors..."