How Many Teeth Do Adults Have? (And Kids, and Wisdom Teeth)

Editorially reviewed by the Dental.me Editorial Team · Updated July 2026

It sounds like a question with one simple answer, but ask a room full of people how many teeth adults have and you’ll get a few different numbers. The reason is the wisdom teeth. A full adult set is 32 permanent teeth, yet a great many adults actually walk around with 28, and both are completely normal. Children, meanwhile, have a smaller set of 20 baby teeth. This guide breaks down exactly how the numbers work, what each tooth does, how dentists arrange and number them, and why the count can vary from one person to the next.

The short answer: 32 for adults, 20 for kids

A complete set of adult (permanent) teeth is 32. That total includes the four wisdom teeth, which are the very last teeth to arrive. Because wisdom teeth are so unpredictable, many adults never reach 32 and instead settle at 28 functional teeth once you subtract the four wisdom teeth. Both figures describe a healthy mouth.

Children have a full set of 20 baby teeth (also called primary or milk teeth). These are smaller, whiter, and temporary. They hold space in the growing jaw and are gradually replaced by the larger permanent set during childhood.

The 32 adult teeth, broken down by type

The 32 permanent teeth aren’t all the same. They fall into four types, and each type does a specific job. Understanding this breakdown makes your dental chart far easier to read, and you can go deeper on what each group does in our guide to the types of teeth.

• 8 incisors — the flat, chisel-shaped front teeth (four on top, four on the bottom) that cut and bite into food.
• 4 canines — the pointed “eye teeth” at the corners of your smile that tear and grip.
• 8 premolars — the transitional teeth behind the canines that crush and tear. Note that children don’t have these at all.
• 12 molars — the large, flat grinding teeth at the back. This group includes the four wisdom teeth (the third molars), which is exactly why the total lands at 32.

Add them up: 8 + 4 + 8 + 12 = 32. Remove the four wisdom teeth from that molar count and you’re left with the 28 teeth that so many adults have.

Kids have 20 baby teeth

The baby set is built on the same idea but with two fewer categories and fewer teeth overall. A child’s 20 primary teeth are made up of 8 incisors, 4 canines, and 8 molars. There are no premolars in the baby set, and there are only eight molars instead of twelve. That’s the whole reason the number drops from 32 to 20.

Baby teeth don’t all appear at once. The first usually breaks through around six months of age, and the set is typically complete by about age three. Then, between roughly ages six and twelve, those baby teeth loosen and fall out one by one as the permanent teeth push up to replace them. If you want to know what to expect and when, our baby teeth timeline walks through the whole sequence.

The wisdom-teeth asterisk: why many adults have 28

Here is where the “32 when all are present” caveat comes from. The wisdom teeth, or third molars, are the four teeth at the very back corners of the mouth, and they are the most variable teeth you have. Two things happen very commonly:

• Some never develop. A fair number of people are simply born without one, two, three, or all four wisdom teeth. This is called being congenitally missing, and it’s a normal variation, not a problem.
• Many are removed. When the jaw doesn’t have room, wisdom teeth can come in sideways, get stuck (impacted), or crowd the neighboring teeth. In those cases dentists often recommend removing them.

Between people who never grew them and people who had them taken out, a huge share of adults functionally have 28 teeth. That’s why the honest answer to “how many teeth do adults have” is: 32 if every tooth is present, but 28 is extremely common and perfectly healthy. To learn what to watch for as these late arrivals appear, see our guide on when wisdom teeth come in.

How teeth are arranged and numbered

Your teeth are organized with a satisfying symmetry. The mouth is divided into four quadrants — upper right, upper left, lower right, and lower left. In an adult with a full set, each quadrant holds exactly 8 teeth: 2 incisors, 1 canine, 2 premolars, and 3 molars. The quadrants mirror one another top-to-bottom and left-to-right, so your upper-right side matches your upper-left, and so on.

Why dentists number your teeth

To talk precisely about a single tooth, dentists give each one a number. In the United States the most common method is the Universal Numbering System, which labels the permanent teeth 1 through 32, starting at the upper-right wisdom tooth and working around the mouth. Other systems exist too, including the Palmer notation and the international FDI two-digit system. Whichever chart your dentist uses, the goal is the same: so that “tooth number 14” always means the same specific tooth. Our overview of the teeth numbering system explains how to read yours.

The eruption order, briefly

Teeth arrive in a predictable pattern. Baby teeth come in roughly front to back. Then the permanent teeth replace them, again generally from the front backward. Importantly, the back molars are extra — they erupt behind the baby teeth without replacing anything. The first permanent molars (the six-year molars) arrive around age six, the second molars (twelve-year molars) around age twelve, and the wisdom teeth typically between ages 17 and 25.

Extra or missing teeth: when the number varies

Not everyone lands exactly on 32 or 28, and that’s more common than people realize. Two natural variations account for most of the differences:

• Extra teeth (hyperdontia). Some people grow one or more “supernumerary” teeth beyond the standard set, meaning they have more than 32. These extras sometimes need removal if they crowd or block other teeth.
• Missing teeth (hypodontia). Some people are born without one or more teeth. Beyond the wisdom teeth, the most commonly absent are the upper lateral incisors (the small teeth beside the two front teeth) and the second premolars.

Because of these variations — plus extractions from injury or decay — the true number in any given mouth can differ from the textbook figure. Your dentist tracks exactly what you have on your personal chart.

Why the count matters, and when to see a dentist

Knowing the numbers isn’t just trivia. It helps you read your own dental chart, understand what your dentist means when they call out a tooth by number, and track whether a child’s teeth are arriving and falling out on a normal schedule. It also helps you recognize what’s typical, so an unexpected extra tooth or a slow-to-appear permanent tooth is something you can ask about with confidence.

To recap: adults have 32 permanent teeth when all are present — 8 incisors, 4 canines, 8 premolars, and 12 molars (including the 4 wisdom teeth) — though many people have 28 after wisdom-tooth removal or because they never developed. Children have 20 baby teeth. Some people naturally have a few more or a few less. It’s worth checking in with a dentist if a baby tooth is very late or very early, if an adult tooth seems to be missing or coming in crowded, if you notice a tooth that doesn’t fit the usual pattern, or simply if it’s been a while since your last exam. A quick look and an up-to-date chart will tell you exactly how many teeth you have and whether everything is where it should be.

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