Could it be more of a genetic thing to have straight teeth or are there outside factors involved too? Not to mention having crooked teeth can cause so many issues but it’s common.
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Crooked or not, they still work just fine. If they become an impediment to reproduction/attractiveness, or somehow lead to more deaths before reproduction is possible, they’ll eventually go the way of the dodo bird. Since that hasn’t been the case, or the case to the extent that it’s obvious, they still appear regularly.
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