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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Some have speculated that smaller faces (relative to the same sized head) are due to sexual selection; humans like a small face. Small-face folks have more offspring, etc. Improved diets mean that there is not a big price to pay for having a smaller face, other than your teeth won’t fit, but modern dentistry and braces address this too.
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