Most adults have 32 teeth. Children have fewer, with a full set of 20 baby teeth typically in place by age 3. The number you actually have right now depends on your age, whether your wisdom teeth came in, and whether you’ve had any teeth removed.
Adult Teeth: The Full 32
A complete adult mouth contains 32 permanent teeth, split evenly between your upper and lower jaws (16 on top, 16 on the bottom). These break down into four types, each shaped for a specific job:
- Incisors (8): The four front teeth on top and four on the bottom. These are your flat, thin-edged teeth built for biting into food.
- Canines (4): The pointed teeth just next to your incisors, one on each side of each jaw. They grip and tear tougher foods like meat.
- Premolars (8): Sitting behind the canines, two on each side of each jaw. They have a flatter surface than canines and help crush food before it reaches the back teeth.
- Molars (12): The large, broad teeth at the back of your mouth, three on each side of each jaw. This count includes your four wisdom teeth. Molars do the heavy grinding that breaks food down enough to swallow.
Why Most People Have Fewer Than 32
While 32 is the biological standard, it’s not the practical reality for most adults. Wisdom teeth are the biggest reason. These four molars, the last to come in, are commonly removed because they crowd existing teeth, grow at odd angles, or only partially break through the gums. Many people have all four wisdom teeth pulled in their late teens or early twenties, which brings the working count down to 28.
Some people are born missing one or more permanent teeth entirely. This is more common than you might think: about 2 to 8 percent of the population is congenitally missing at least one tooth (not counting wisdom teeth). On the flip side, a small number of people develop extra teeth beyond the normal 32. This occurs in roughly 2 to 3 percent of the population and happens more often in the upper jaw.
Children’s Teeth: The First 20
Baby teeth, also called primary teeth, begin erupting around 6 months of age. By age 3, most children have all 20 in place: 10 in the upper jaw and 10 in the lower. Children don’t have premolars or wisdom teeth, so their set is simpler, with just incisors, canines, and a smaller number of molars.
These primary teeth start falling out around age 6 as permanent teeth push through. The transition happens gradually and typically finishes by age 12 or 13, except for wisdom teeth, which may not appear until the late teens or early twenties. During this mixed stage, kids have a combination of baby and adult teeth in their mouth at the same time.
Tooth Loss as You Age
The number of teeth in your mouth naturally tends to decrease over a lifetime. Gum disease, decay, and injury all take a toll. CDC data from 2015 to 2018 found that about 13 percent of adults aged 65 and older had lost all of their natural teeth. That rate climbed with age: roughly 9 percent for adults 65 to 69, about 11 percent for ages 70 to 74, and nearly 18 percent for those 75 and older.
Keeping your full set of teeth into old age is increasingly common compared to previous generations, largely because of fluoride in water, better dental care, and improved hygiene habits. Still, losing a tooth or two over a lifetime is the norm rather than the exception for most people.
Quick Count by Age
- By age 3: 20 baby teeth
- Ages 6 to 12: A mix of baby and adult teeth, gradually shifting toward the permanent set
- Late teens and beyond: Up to 32 adult teeth, though 28 is the most common functional number after wisdom tooth removal