Adult humans typically have 32 permanent teeth.
Those teeth are divided between the upper and lower jaws: 16 in the maxilla and 16 in the mandible. A complete adult set contains eight incisors for cutting, four canines for tearing, eight premolars for crushing, and twelve molars for grinding. The last four molars are commonly called wisdom teeth.
Humans develop two successive sets of teeth, a pattern called diphyodonty. Children usually have 20 primary, or baby, teeth. As the jaws grow, those teeth are replaced by permanent teeth, with the first adult teeth commonly appearing around ages five or six. Wisdom teeth often erupt between ages 17 and 25, although they may remain impacted, never erupt, or never develop.
“Typically” matters because not every adult has 32 visible teeth. Dental extractions, missing teeth, impacted wisdom teeth, and congenital differences can reduce the number. Conversely, rare extra teeth are called supernumerary teeth.