Dictionary of Human Evolution and Biology

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Fourth Premolar

Most distal premolar in the primitive mammalian dentition. During evolution, primates have lost anterior premolars; thus the most posterior premolar is actually the fourth premolar, even though no species has four premolars. Humans have only two premolars, but they are premolars three and four from the primitive mammalian set of teeth.

See P1, P2, P3, etc.

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