Humans have two sets of teeth over their lifetime:

• Primary (baby) teeth: 20 teeth in total, with 10 in the upper jaw and 10 in the lower jaw. These begin to appear around 6 months of age and start falling out around age 5 to make way for permanent teeth

• Permanent (adult) teeth: Most adults have 32 teeth in total, with 16 in the upper jaw and 16 in the lower jaw. This full set typically emerges by the late teens to early twenties

The 32 adult teeth are categorized as follows:

• 8 incisors (front teeth used for cutting)
• 4 canines (pointed teeth for tearing)
• 8 premolars (bicuspids, used for slicing and tearing)
• 12 molars (including 4 wisdom teeth, used for grinding food)

Wisdom teeth are the third set of molars that often emerge between ages 17 and 25 and are frequently removed due to crowding or impaction

. In summary, an adult human mouth typically contains 32 teeth, while children have 20 primary teeth.