The responses here are wild!
My take: teeth have always been crooked to some extent or other for hundreds of thousands of years.
Civilization dates back a few thousand years.
Medical expertise to perform dental intervention for straight teeth only a few hundred years.
Our animal bodies were built for a much older foundation: one of previous 100 thousand years where the requirements were to reach age and reproduce. Our diets were rougher back then.
I think there are a lot of other good ideas in the comments. Ultimately, since is bio, I’d say it’s a comfortable synergy of a bunch.
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