As well as diet, I think there is some evidence that bottle feeding is more likely to lead to crooked teeth than is breast feeding. It should be interesting to see what studies show with there having been a resurgence in breastfeeding in recent decades. There were many decades where bottle feeding was considered the modern, scientific option and breastfeeding was not encouraged, so one would expect there to have been more crooked teeth formed by infants growing up on those decades.
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