Adults have 32 permanent teeth, and children have 20 baby teeth. That said, most adults walking around today have fewer than 32 because wisdom teeth are so commonly removed. Your actual count depends on your age, whether your wisdom teeth came in, and whether you were born with any naturally missing or extra teeth.
Adult Teeth: The Full Set of 32
A complete adult mouth contains 32 teeth, split evenly between your upper and lower jaws (16 on top, 16 on the bottom). Dentists number them 1 through 32, starting from the upper right wisdom tooth and wrapping around to the lower right. Those 32 teeth break down into four types, each shaped for a specific job:
- Incisors (8 total): The four front teeth on top and four on the bottom. They have thin, flat edges designed for biting into food, like slicing into an apple.
- Canines (4 total): The pointy teeth just next to your incisors, one on each side of each jaw. These are built for tearing tougher foods like meat and crunchy vegetables.
- Premolars (8 total): Sitting behind the canines, two on each side of each jaw. They have a broader surface than canines and help tear, crush, and grind food into smaller pieces.
- Molars (12 total): The large, flat teeth at the back of your mouth, three on each side of each jaw. These are your primary chewing teeth, responsible for crushing and grinding food before you swallow. The last molar in each row is the wisdom tooth.
Children’s Teeth: 20 Baby Teeth
Children start out with 20 primary (baby) teeth. These begin appearing around 6 months of age and are usually all in place by age 2 or 3. Kids have the same incisors, canines, and molars as adults, but they don’t have premolars. That accounts for the difference: 8 fewer premolars and 4 fewer molars (no wisdom teeth) brings the count from 32 down to 20.
Baby teeth fall out at various times throughout childhood as permanent teeth push through underneath them. The transition typically starts around age 6 and continues into the early teens. By age 21, all 32 permanent teeth have usually erupted, according to the American Dental Association.
Why Most Adults Have Fewer Than 32
If you counted your teeth right now, you’d probably land somewhere between 24 and 31. The most common reason is wisdom tooth removal. About 50% of people in the U.S. have had at least one wisdom tooth extracted by age 25, and that number climbs to roughly 70% by age 60. Wisdom teeth often get pulled because there isn’t enough room in the jaw for them to come in properly, leading to impaction, crowding, or infection.
If all four wisdom teeth are removed, your count drops to 28, which is the most common number for adults who’ve had the procedure. Some people never develop all four wisdom teeth in the first place, putting them at 29, 30, or 31 even without any extractions.
Naturally Missing or Extra Teeth
Not everyone is born with the genetic blueprint for exactly 32 teeth. Some people are congenitally missing one or more permanent teeth, a condition called hypodontia. Excluding wisdom teeth, somewhere between 0.15% and 16% of the population is affected, depending on the specific population studied. Wisdom teeth are the most commonly absent tooth, but premolars and upper lateral incisors (the teeth flanking your two front teeth) can also be missing.
On the flip side, about 0.5% to 4% of people develop extra teeth beyond the standard 32, known as supernumerary teeth. These extra teeth most often appear in the upper jaw near the front teeth. Dental numbering systems even account for this: the ADA’s universal system reserves numbers 51 through 82 specifically for supernumerary teeth.
Quick Count by Age
If you’re trying to figure out whether your count is normal, here’s a rough guide. A baby under 6 months typically has zero visible teeth. By age 3, most children have all 20 baby teeth. Between ages 6 and 12, kids have a mix of baby and permanent teeth, so the number fluctuates. By the late teens, most people have 28 permanent teeth with their four wisdom teeth still potentially on the way. By 21, the full set of 32 is usually complete, assuming all teeth developed and none were removed.
Losing baby teeth ahead of schedule or behind schedule by a year or so is normal. But if a permanent tooth hasn’t appeared long after the baby tooth fell out, a dental X-ray can reveal whether the adult tooth is present under the gum or was never there to begin with.