There are genetic factors to this, but a lot of it is caused by outside factors. A big one is the introduction of pacifiers and feeding bottles for babies. They chew on this hard plastic, and it pushes their teeth out of alignment. It’s the same effect retainers hsve on your teeth, only the other way. It’s worth noting that this mostly have an effect on the “overbite” phenomenon, where all or most of your upper front teeth get pushed forward.
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