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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In the days before modern dental care, people were far more likely to lose teeth as adults due to infection or damage. Therefore we have more adult teeth than can comfortably fit in most of our mouths so that we could lose a few and still have a mostly complete working set. Now that very few people lose adult teeth, the extra teeth are just causing overcrowding.
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