In what direction has evolution tended to change the teeth of primates?

Question

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Evolution has tended to change the teeth of primates towards fewer, smaller teeth. This is because as primates evolved to eat softer and more varied diets, the need for large, sharp teeth decreased. Additionally, smaller teeth are less likely to develop cavities and other dental problems, which increases an individual's chances of survival and reproductive success.

In What Direction Has Evolution Tended to Change the Teeth