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introductionstatpearls· Introduction· item NBK570590

Humans have two sets of teeth during their lifetime: the initial deciduous (primary) teeth and the successive permanent (secondary) teeth.[1] There are typically 20 deciduous teeth divided evenly across the maxilla and mandible. The deciduous teeth eventually exfoliate and are replaced by 32 permanent teeth: 16 in the maxilla and 16 in the mandible. Permanent teeth are classified as incisors, canines, premolars, and molars, while primary teeth do not include premolars.