Adults have 16 teeth on the top jaw when all permanent teeth are present, including wisdom teeth. This is exactly half of the full adult set of 32. Those 16 upper teeth break down into four distinct types, each with a specific job in biting and chewing.
The 16 Upper Teeth by Type
Your upper jaw is divided into a left side and a right side, and each side mirrors the other perfectly. Here’s what you’ll find across the full upper arch:
- 4 incisors (two central, two lateral): the flat front teeth you use to bite into food
- 2 canines (one per side): the pointed teeth next to the incisors, built for gripping and tearing
- 4 premolars (two per side): slightly wider teeth behind the canines that crush and grind
- 6 molars (three per side): the large, flat teeth at the back that do the heaviest grinding, including your two upper wisdom teeth
The lower jaw has the same layout, giving you 32 teeth total. Each upper tooth lines up with a partner on the bottom to work as a pair when you chew.
When Upper Teeth Come In
Your permanent upper teeth don’t all arrive at once. The process stretches from early childhood into young adulthood. The first molars are actually the earliest to appear, breaking through around ages 5 to 7. The central incisors follow at 7 to 8, and the lateral incisors come in at 8 to 9.
There’s a gap after that. The first premolars erupt around 10 to 11, followed by the canines and second premolars at 11 to 12, and the second molars at 12 to 13. The wisdom teeth (third molars) are the last to arrive, typically between ages 17 and 21, though they often don’t come in at all.
Why Many Adults Have Fewer Than 16
Having all 16 upper teeth is actually less common than you might expect. The biggest reason is wisdom teeth. In about 8 out of 10 people, at least one wisdom tooth fails to fully emerge, whether it stays trapped beneath the gum (impacted) or simply never develops. Since two of your upper teeth are wisdom teeth, many adults functionally have 14 upper teeth instead of 16.
Beyond wisdom teeth, some people are born missing one or more permanent teeth entirely. This condition, called hypodontia, affects roughly 4 to 5.5% of the population. The upper lateral incisors, the teeth just beside your two front teeth, are among the most commonly missing. When a tooth never develops, there’s no baby tooth replacement waiting underneath, and the gap may stay empty unless treated with dental work.
How Dentists Number Your Upper Teeth
When your dentist calls out numbers during an exam, they’re using the Universal Numbering System approved by the American Dental Association. The upper teeth are numbered 1 through 16, starting at the upper right wisdom tooth (tooth 1) and moving across the arch to the upper left wisdom tooth (tooth 16). The lower teeth continue from 17 to 32.
So if your dentist says “tooth 8,” that’s your upper right central incisor, one of your two front teeth. “Tooth 14” is your upper left first molar. Knowing this can help you follow along when your dentist discusses a specific tooth during a visit. The numbering always stays the same regardless of whether a tooth is actually present, so even if your wisdom teeth were removed, teeth 1 and 16 still refer to those positions.
What Each Type of Upper Tooth Does
Your four upper incisors are thin and flat-edged, designed for slicing. When you bite into an apple, these teeth do the initial cutting. The two canines sit at the corners of your smile and are the longest-rooted teeth in your mouth. Their pointed shape lets them grip and tear tougher foods like meat.
Behind the canines, the four premolars have a broader, flatter surface with two small ridges on top. They serve as a transition between the tearing action of canines and the heavy grinding of molars. Your six upper molars, the largest teeth in your mouth, have wide surfaces with multiple ridges. They handle the bulk of chewing, breaking food down into small enough pieces to swallow. The wisdom teeth at the very back are a third set of molars that most modern jaws don’t have room for, which is why they so frequently cause crowding or need removal.