Most adults have 32 permanent teeth. That full set includes eight incisors (your front teeth), four canines (the pointed ones), eight premolars, and 12 molars, which includes four wisdom teeth. In practice, though, many adults end up with 28 or fewer, since wisdom teeth are frequently removed or never develop at all.
What Each Type of Tooth Does
Your 32 teeth break down into four groups, each shaped for a different job. The eight incisors sit front and center, four on top and four on bottom, and handle biting into food. Flanking them are four canines, the sharpest teeth in your mouth, built for tearing. Behind those sit eight premolars, which have flat tops for crushing. And the 12 molars at the back, including your wisdom teeth, do the heavy grinding.
Children start with just 20 baby teeth. The jump to 32 happens gradually as baby teeth fall out and permanent teeth replace them, with additional molars filling in the extra space as the jaw grows.
When Each Tooth Comes In
Permanent teeth don’t arrive all at once. The process starts around age 6 and, if wisdom teeth are included, can stretch all the way to age 21. Here’s the typical timeline:
- Ages 6 to 7: The first adult molars and lower central incisors come in. These are often the first permanent teeth a child notices.
- Ages 7 to 9: The remaining incisors erupt, upper and lower.
- Ages 9 to 12: Canines and premolars fill in. The lower canines tend to appear around 9 to 10, while the upper canines come closer to 11 or 12.
- Ages 11 to 13: Second molars emerge behind the first molars.
- Ages 17 to 21: Wisdom teeth (third molars) are the last to arrive, if they come in at all.
By roughly age 13, most teenagers have 28 permanent teeth in place. The final four, the wisdom teeth, are the wild card.
Why Many Adults Have Fewer Than 32
A full set of 32 is the textbook number, but relatively few adults actually keep all of them. The biggest reason is wisdom teeth. About 22.6% of people worldwide never develop one or more wisdom teeth at all, a rate that climbs to nearly 30% in Asian populations. For those who do develop them, removal is extremely common. Around 10 million wisdom teeth are extracted from roughly 5 million people in the United States every year, and the American Association of Oral and Maxillofacial Surgeons has estimated that about 85% of wisdom teeth will eventually need to come out. So a count of 28 teeth is, for many adults, the practical norm.
Beyond wisdom teeth, some people are born missing other permanent teeth entirely, a condition called hypodontia. This affects roughly 5% of the population, and it’s slightly more common in women. The teeth most likely to be absent are the upper lateral incisors (the ones next to your front teeth) and the lower second premolars. On the opposite end of the spectrum, about 1% to 4% of people develop extra teeth, a condition called hyperdontia.
How Many Teeth Adults Actually Keep Over Time
Tooth loss from decay, gum disease, and injury chips away at the total as people age. CDC surveillance data from 2024 paints a clear picture of this decline. Adults aged 20 to 34 have an average of 27 natural teeth. By ages 50 to 64, that number drops to 23.3. Adults 65 to 74 average 21.7 teeth, and those 75 and older have about 19.8.
These averages also vary significantly by income, education, and smoking status. Among adults 65 and older, current smokers retain an average of just 16.3 teeth, compared to the overall average of 21.7 for that age group. Adults with less than a high school education in that same age range average 16.8 teeth. These gaps reflect differences in access to dental care and exposure to risk factors for gum disease and decay over a lifetime.
The Short Answer
The complete adult set is 32 teeth. Subtract the four wisdom teeth that most people lose or never grow, and 28 is the number you’ll find in most adult mouths. From there, the count gradually decreases with age, landing around 20 to 22 for adults over 65.