Adults have 32 teeth in a full set, while children have 20. That complete adult count includes four different types of teeth, each shaped for a specific job in breaking down food. Not everyone ends up with exactly 32, though, since wisdom teeth are frequently removed and some people are born missing one or more permanent teeth.
The 32 Adult Teeth by Type
Your 32 permanent teeth break down into four categories, evenly split between your upper and lower jaws.
- Incisors (8): The four front teeth on top and four on the bottom. Each has a thin, flat edge designed to cut into food when you bite, like slicing through an apple.
- Canines (4): The pointed teeth sitting just next to your incisors, one on each side of each jaw. These are your tearing teeth, built for ripping through meat and crunchy vegetables.
- Premolars (8): Two on each side of each jaw, sitting behind the canines. Premolars are hybrids with features of both canines and molars, helping you tear, crush, and grind food into smaller pieces.
- Molars (12): Three on each side of each jaw, including your wisdom teeth. Molars are your primary chewing teeth, with broad, flat surfaces built for crushing and grinding.
The last four of those 12 molars are your third molars, commonly called wisdom teeth. Many people have them removed in their late teens or early twenties due to crowding or impaction, which is why plenty of adults walk around with 28 teeth and consider that their normal set.
Children’s Teeth: The Starter Set of 20
Baby teeth, also called primary teeth, number 20 in total. They include incisors, canines, and molars, but no premolars. That’s the key difference from the adult set. Children have 8 incisors, 4 canines, and 8 molars spread across both jaws.
These teeth start appearing around 6 months of age and typically finish coming in by age 3. They then fall out at various points throughout childhood as permanent teeth push through to replace them. By around age 21, all 32 permanent teeth have usually erupted, with the wisdom teeth being the last to arrive.
When the Count Varies
Not everyone gets exactly 32 permanent teeth, even setting wisdom teeth aside. Roughly 3 to 10 percent of people are congenitally missing at least one permanent tooth, meaning it simply never developed. That works out to about one in every 10 to 12 people, and it’s slightly more common in women than men. The most frequently missing teeth (other than wisdom teeth) tend to be the upper lateral incisors, the teeth right next to your two front teeth, and the second premolars.
The opposite can happen too. Some people develop extra teeth beyond 32, a condition called hyperdontia. These supernumerary teeth most often appear in the upper jaw near the front teeth. They’re less common than missing teeth and usually need to be removed if they crowd or block the normal teeth from coming in properly.
Why Each Type Matters
The four tooth types work as a system. When you take a bite of a sandwich, your incisors shear off a piece, your canines help tear through tougher components, and your premolars and molars progressively crush everything into a soft, swallowable mass. Losing teeth at any point in that chain changes how efficiently you chew, which is one reason dentists prioritize replacing missing teeth with bridges, implants, or dentures rather than simply leaving gaps.
Your molars do the heaviest work and take the most abuse, which is why they’re the most cavity-prone teeth in your mouth. Their broad chewing surfaces have grooves and pits where food particles easily get trapped. That’s also why dental sealants, thin protective coatings painted onto molar surfaces, are commonly applied to children’s permanent molars as soon as they come in.