Adults have 32 permanent teeth, while children have 20 primary (baby) teeth. That said, the number of teeth actually sitting in your mouth right now depends on your age, whether your wisdom teeth came in, and whether you’ve had any removed or lost along the way.
The 32 Adult Teeth by Type
A full set of adult teeth breaks down into four types, each shaped for a specific job:
- Incisors (8): The four front teeth on top and four on the bottom. These are your flat, chisel-shaped teeth for biting into food.
- Canines (4): The pointed teeth on either side of the incisors, one in each corner. They tear tougher foods like meat.
- Premolars (8): Sitting just behind the canines, two on each side of each jaw. They have a flatter surface for crushing and grinding.
- Molars (12): The large teeth at the back, three on each side of each jaw. This group includes the four wisdom teeth (third molars), which are the last to arrive.
Without wisdom teeth, you’d have 28 permanent teeth. Many people count 28 as their “full” set because wisdom teeth are so commonly removed or never develop at all.
Children’s Teeth: The First Set of 20
Baby teeth start appearing around 6 months of age. By roughly age 3, most children have all 20 primary teeth in place: eight incisors, four canines, and eight molars. Children don’t get premolars in their first set.
These teeth begin falling out around age 6, and the transition from baby teeth to permanent teeth continues through childhood. The process is gradual. The lower front teeth usually go first, while the last baby molars often hang on until age 11 or 12. By age 21, all 32 permanent teeth have typically erupted, including any wisdom teeth that are going to come in.
Why Wisdom Teeth Change the Count
Wisdom teeth are the biggest variable in how many teeth you actually have. In a large study of the Kazakh population, over 37% of people were missing at least one wisdom tooth entirely, meaning the tooth simply never formed. This isn’t a dental problem. It’s a common genetic variation, and the trend appears to be increasing as human jaws gradually get smaller over generations.
Even when wisdom teeth do develop, they’re frequently removed. They often come in at awkward angles or get trapped beneath the gum line (impacted), which can crowd other teeth or cause infections. So while 32 is the textbook number, plenty of healthy adults have 28 teeth or fewer and always will.
How Many Teeth People Actually Have
Data from the National Institute of Dental and Craniofacial Research paints a realistic picture. Americans aged 20 to 34 have an average of 27 permanent teeth remaining. That number drops to 25.5 for people aged 35 to 49, and to 23.4 for those aged 50 to 64. Tooth loss accumulates over a lifetime from decay, gum disease, and injury, so the gap between the theoretical 32 and reality widens with age.
Naturally Missing or Extra Teeth
Some people are born without certain permanent teeth, a condition called hypodontia. Excluding wisdom teeth, about 3 to 10% of the population is congenitally missing at least one tooth. It’s slightly more common in women. The teeth most likely to be absent are the lower second premolars and the upper lateral incisors (the teeth just beside your two front teeth on top).
On the other end, some people develop extra teeth beyond the standard 32, a condition called hyperdontia. These supernumerary teeth most commonly appear near the upper front teeth or behind the molars. They sometimes need to be removed if they crowd or block other teeth from coming in normally.
In rare cases, a person may be missing six or more permanent teeth (oligodontia), which typically has a genetic component and may require dental implants or bridges to restore function.