Adults typically have 32 teeth, though many people have between 24 and 28 depending on whether their wisdom teeth have come in or been removed. Counting your own teeth is straightforward once you know where to start and what each type of tooth looks like. Here’s how to do it and what the numbers mean.
How to Count Your Own Teeth
The easiest method is to use your tongue and a mirror. Start at the very back of one side of your upper jaw and work your way forward to the front teeth, then continue along the other side to the back. Count each tooth you can feel or see. Then do the same for your lower jaw.
You’ll want to divide your mouth into four sections, called quadrants. Dentists use these same quadrants when charting your teeth:
- Upper right: from your back-right molar to the center of your upper jaw
- Upper left: from the center of your upper jaw to your back-left molar
- Lower left: from your back-left molar to the center of your lower jaw
- Lower right: from the center of your lower jaw to your back-right molar
Each quadrant holds up to 8 teeth in a full adult set. Count each quadrant separately, write down the number, and add them up. This makes it harder to lose track compared to trying to count all 32 at once.
What Each Type of Tooth Looks Like
Knowing the five types helps you identify what you’re counting, especially when trying to figure out if any are missing.
Incisors are the 8 flat teeth right at the front of your mouth, 4 on top and 4 on the bottom. Each one has a single narrow edge designed for biting into food. Canines are the pointy teeth sitting just behind your incisors, one on each side of each jaw (4 total). They resemble small fangs and are easy to spot.
Premolars (also called bicuspids) sit between your canines and your molars. You have 8 in a full set, 2 per quadrant. They look like a cross between a canine and a molar, with a broader surface than canines but smaller than your back teeth. Molars are the large, flat teeth at the very back of your mouth. You have up to 12 total, including your wisdom teeth. These are your main chewing teeth, built for crushing and grinding food.
A full adult set breaks down like this: 8 incisors, 4 canines, 8 premolars, and 12 molars.
Why Your Count Might Not Be 32
Most adults count fewer than 32 teeth, and that’s normal. The most common reason is wisdom teeth. These are the four molars at the very back of each quadrant, and many people have them removed to relieve crowding. Some people’s wisdom teeth never come through the gums at all. If all four are gone or absent, your count will be 28.
Some people are born without certain teeth entirely. The second premolars are the most frequently missing, followed by the first premolars and lateral incisors (the teeth flanking your front two). This is a congenital trait, not a disease, and it’s common enough that your dentist won’t be surprised by it.
On the other end, a small percentage of people (roughly 1% to 3%) develop extra teeth, a condition called hyperdontia. Extra teeth most often appear in the upper jaw, typically right behind the upper front teeth. If your count comes out to 33 or 34, this could be why.
How Dentists Number Your Teeth
When your dentist says something like “tooth number 19,” they’re using a standardized numbering system so every provider reading your chart knows exactly which tooth they mean. In the United States, dentists use the Universal Numbering System established by the American Dental Association. It assigns each of the 32 permanent teeth a number from 1 to 32.
The count starts at your upper right wisdom tooth (number 1) and moves forward along the upper jaw to the upper left wisdom tooth (number 16). Then it drops down to the lower left wisdom tooth (number 17) and sweeps across the bottom jaw, ending at the lower right wisdom tooth (number 32). Think of it as tracing a big horseshoe shape across the top, then continuing in a U along the bottom.
Some key landmarks to remember: teeth 8 and 9 are your two upper front teeth. Teeth 24 and 25 are your two lower front teeth. Teeth 1, 16, 17, and 32 are your wisdom teeth.
The International System
Outside the U.S., most countries use the FDI system, which gives each tooth a two-digit number. The first digit tells you the quadrant (1 for upper right, 2 for upper left, 3 for lower left, 4 for lower right), and the second digit tells you which tooth within that quadrant, counting from the center outward. So tooth 11 is the upper right central incisor, and tooth 36 is the lower left first molar. For baby teeth, the quadrants are numbered 5 through 8 instead.
Counting a Child’s Teeth
Children have 20 baby teeth (also called primary teeth) instead of 32. Each quadrant holds 5 teeth: 2 incisors, 1 canine, and 2 molars. There are no premolars in a baby set. These teeth typically all arrive by age 3 and start falling out around age 6 as the permanent teeth push through.
Between roughly ages 6 and 12, your child will have a mix of baby teeth and permanent teeth, which can make counting confusing. During this transition, the total fluctuates as teeth fall out and new ones emerge. If you’re trying to track your child’s dental development, count the baby teeth and adult teeth separately. The permanent molars that appear behind the baby teeth around age 6 are the easiest new arrivals to spot since they grow into empty space rather than replacing a baby tooth.
Tips for an Accurate Count
Use a small mirror, good lighting, and a clean finger. Partially erupted teeth, especially wisdom teeth, can be easy to miss if only a small portion has broken through the gum. Run your finger along the gum line behind your last visible molar on each side to check for any teeth just starting to emerge. Count at least twice and compare results. If you get a different number each time, count each quadrant individually and add the totals together.