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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Hello, I am a dentist. All the answers are wrong.
It is not related to diet change because evolutionary processes cannot be so rapid. The answer is much simpler. Tooth alignment is present if the size of the teeth is appropriate for the size of the jaws. If the teeth are too large relative to the jaws, they will crowd together. Tooth and jaw size are genetically determined. The population was once composed of communities with the same gene pool, and having straight teeth is an evolutionary advantage. When humans began to colonize new territories the gene pools became mixed, and offspring of parents from different backgrounds could inherit jaw size from one parent and tooth size from the other parent. This causes misalignment of teeth.
To prove this just look at small communities in remote places, they still have straight teeth.
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