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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Because modern people have much better diets and healthcare.
In the older times poorer diets would mean teeth wouldn’t grow so big and bad medicine would mean some teeth would fall out as a person grew older.
All this means there was more room for remaining teeth. Lack of room is what causes them to become crooked.
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