Teeth Names and Numbers: Look Up Any of the 52 Teeth

Find any tooth

Every tooth has its own page: where it sits, its Universal, FDI and Palmer numbers, when it comes in, its roots and the problems it most often has. Pick a number or letter below, or type any code into the Tooth Number Chart & Converter.

Adult teeth (Universal 1–32)

Baby teeth (Universal A–T)

Upper right A–E

Upper left F–J

Lower left K–O

Lower right P–T

Tooth facts at a glance

	Adult teeth	Baby teeth
How many	32: 8 incisors, 4 canines, 8 premolars, 12 molars	20: 8 incisors, 4 canines, 8 molars
Universal numbers (US)	1–32	A–T
FDI numbers (international)	11–18, 21–28, 31–38, 41–48	51–55, 61–65, 71–75, 81–85
First ones come in	About 6–7 years: first molars and lower central incisors	About 6–10 months: lower central incisors
All usually in by	About 21 years, wisdom teeth included	About 3 years

Ages are from the ADA eruption charts. Every child is a little different, so think of them as ranges, not deadlines.

Why tooth numbers are confusing

Three numbering systems are in use. The Universal system (1–32 and A–T) is the one accepted by the American Dental Association and used on US dental claims. The FDI system, used internationally and in World Health Organization surveys, gives each tooth two digits: the quarter of the mouth, then the position from the middle. Palmer notation uses a bracket for the quarter, like 6┘.

The trouble is that the same number can point to different teeth. "Tooth 16" is the upper left wisdom tooth on a US chart, but the upper right first molar in FDI. The converter shows every match when a number is valid in more than one system.

Dental charts are also drawn as if you're facing the patient, so your right side appears on the left of the chart. Each tooth page spells this out, with a highlighted mini chart.

Which tool do I need?

"What tooth is number 19?" Use the Tooth Number Chart & Converter, or go straight to the tooth's page above.
"Which teeth should my child have at this age?" Use the Tooth Eruption Chart, which shows baby and adult teeth at any age from birth to 30.
"When will my baby's next teeth come in?" The Teething Calculator works from your baby's birth date.
"I need a blank tooth chart." The Tooth Number Chart has free printable adult and baby charts.
"How much radiation was that X-ray?" The Dental X-Ray Radiation Comparator adds up bitewings, panoramic, full-mouth and 3D scans.
"What's a dog's dental formula?" The Dental Formula Calculator has 36 kinds of mammal and a quiz.

X-rays and dental formulas

Two more tools cover questions that go beyond single teeth. The Dental X-Ray Radiation Comparator shows the dose of the X-rays you had or were offered, in microsieverts. It compares them with natural background radiation, a coast-to-coast flight and a chest X-ray, and explains current advice on pregnancy, children and thyroid collars. The Dental Formula Calculator turns a formula like 2.1.2.3/2.1.2.3 into a tooth count. It covers people and 35 other kinds of mammal, with baby-teeth formulas, a quiz and a "check my formula" mode for students.

Frequently asked questions

How many teeth do adults and children have?

Adults usually have 32 teeth, including 4 wisdom teeth. Children have 20 baby teeth, usually all in by about age 3. See the Tooth Eruption Chart for when each one arrives.

What tooth is number 30?

In the Universal system used in the US, tooth 30 is the lower right first molar, the "6-year molar". In FDI it is 46. See tooth 30.

Are tooth numbers the same in every country?

No. The US uses the Universal system (1–32, A–T), while many other countries and international surveys use the two-digit FDI system (11–48, 51–85). The converter translates between them.

Which teeth are wisdom teeth?

The four third molars at the very back: Universal 1, 16, 17 and 32 (FDI 18, 28, 38 and 48). They usually come in at 17–21 years (ADA), if at all.

What do the tooth numbers on my dental bill mean?

They're usually Universal numbers, the system used on the ADA dental claim form: 1–32 for adult teeth, starting with the upper right wisdom tooth, and A–T for baby teeth. So "#30" on a bill is the lower right first molar. Look up any number in the Tooth Number Chart, and use the Dental Insurance Calculator to estimate what your plan pays.

Sources

American Dental Association (MouthHealthy). Permanent Tooth Development (eruption chart). 2012. Accessed October 26, 2026.
American Dental Association (MouthHealthy). Primary Tooth Development (eruption chart). 2012. Accessed October 26, 2026.
American Dental Association (MouthHealthy). Eruption Charts. Accessed October 26, 2026.
American Dental Association. ADA Dental Claim Form (tooth designation systems). Accessed October 26, 2026.
World Health Organization. Oral health surveys: basic methods, 5th edition (tooth notation after ISO 3950). 2013. Accessed October 26, 2026.
Cleveland Clinic. Teeth: Anatomy, Types, Function & Care. last updated January 26, 2023. Accessed October 26, 2026.
Dentalcare.com (continuing education course CE500). An Overview of Dental Anatomy: Primary Dentition. Accessed October 26, 2026.
Nelson SJ. Elsevier. Wheeler's Dental Anatomy, Physiology and Occlusion, 11th edition. 2019.

Last reviewed October 26, 2026 by the Dental Health Time editorial team, against the sources above. How we review.

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