If you’ve ever sat in a dentist’s chair and heard them call out numbers like “14 has a cavity” or “missing tooth 32,” you might have wondered — what do those tooth numbers mean? This complete tooth number chart guide breaks down exactly how teeth are numbered, what each tooth is called, and why dentists use this system every single day.
Whether you’re a curious patient, a parent tracking your child’s dental development, or just someone who Googled “tooth numbering system” after a confusing dental appointment — you’re in the right place.
What Is a Tooth Number Chart?
Table of Contents
A tooth number chart is a diagram used by dentists and dental professionals to identify each individual tooth in your mouth using a number or letter system. Rather than saying “the second molar on the upper right,” a dentist can simply say “tooth 2” — making communication faster and reducing errors in patient records.
There are three main tooth numbering systems used around the world:
- Universal Numbering System — used in the United States
- Palmer Notation System — used in the UK and some other countries
- FDI World Dental Federation System — used internationally
In the US, the Universal Numbering System is the standard, so that’s what we’ll focus on — but we’ll cover all three so you’re fully informed.
The Universal Tooth Numbering System (US Standard)
The Universal Numbering System assigns a number from 1 to 32 to each permanent (adult) tooth, starting from the upper right back molar and moving around the mouth. Here’s exactly how it works:
Upper Teeth (Maxillary Arch) — Teeth #1–16
Numbering starts at the upper right and moves left across the top of the mouth:
- #1 — Upper right third molar (wisdom tooth)
- #2 — Upper right second molar
- #3 — Upper right first molar
- #4 — Upper right second premolar (bicuspid)
- #5 — Upper right first premolar (bicuspid)
- #6 — Upper right canine (cuspid)
- #7 — Upper right lateral incisor
- #8 — Upper right central incisor
- #9 — Upper left central incisor
- #10 — Upper left lateral incisor
- #11 — Upper left canine (cuspid)
- #12 — Upper left first premolar (bicuspid)
- #13 — Upper left second premolar (bicuspid)
- #14 — Upper left first molar
- #15 — Upper left second molar
- #16 — Upper left third molar (wisdom tooth)
Lower Teeth (Mandibular Arch) — Teeth #17–32
Numbering continues from the lower left and moves right across the bottom of the mouth:
- #17 — Lower left third molar (wisdom tooth)
- #18 — Lower left second molar
- #19 — Lower left first molar
- #20 — Lower left second premolar (bicuspid)
- #21 — Lower left first premolar (bicuspid)
- #22 — Lower left canine (cuspid)
- #23 — Lower left lateral incisor
- #24 — Lower left central incisor
- #25 — Lower right central incisor
- #26 — Lower right lateral incisor
- #27 — Lower right canine (cuspid)
- #28 — Lower right first premolar (bicuspid)
- #29 — Lower right second premolar (bicuspid)
- #30 — Lower right first molar
- #31 — Lower right second molar
- #32 — Lower right third molar (wisdom tooth)
Quick tip: Wisdom teeth are always #1, #16, #17, and #32 in the Universal system.
Baby Tooth Number Chart (Primary Teeth)
Children have 20 primary (baby) teeth, and they use a different tooth numbering system — letters A through T instead of numbers. Baby teeth begin erupting around 6 months of age and are typically all in by age 3. They start falling out around age 6 as permanent teeth push through.
Upper Baby Teeth (A–J)
- A — Upper right second primary molar
- B — Upper right first primary molar
- C — Upper right primary canine
- D — Upper right lateral incisor
- E — Upper right central incisor
- F — Upper left central incisor
- G — Upper left lateral incisor
- H — Upper left primary canine
- I — Upper left first primary molar
- J — Upper left second primary molar
Lower Baby Teeth (K–T)
- K — Lower left second primary molar
- L — Lower left first primary molar
- M — Lower left primary canine
- N — Lower left lateral incisor
- O — Lower left central incisor
- P — Lower right central incisor
- Q — Lower right lateral incisor
- R — Lower right primary canine
- S — Lower right first primary molar
- T — Lower right second primary molar
Tooth Eruption Chart: When Do Teeth Come In?
Knowing when teeth should erupt is just as important as knowing their numbers. Here’s a general tooth eruption chart for both baby teeth and permanent teeth.
Primary (Baby) Tooth Eruption Chart
- Central incisors: 6–12 months (lower first, then upper)
- Lateral incisors: 9–16 months
- First molars: 13–19 months
- Canines: 16–23 months
- Second molars: 23–33 months
Permanent Tooth Eruption Chart
- First molars (#3, #14, #19, #30): 6–7 years
- Central incisors (#8, #9, #24, #25): 6–8 years
- Lateral incisors (#7, #10, #23, #26): 7–9 years
- First premolars (#5, #12, #21, #28): 10–11 years
- Second premolars (#4, #13, #20, #29): 10–12 years
- Canines (#6, #11, #22, #27): 11–13 years
- Second molars (#2, #15, #18, #31): 12–13 years
- Third molars/wisdom teeth (#1, #16, #17, #32): 17–21 years
Types of Teeth and What They Do
Understanding your tooth number chart is even more useful when you know what each type of tooth actually does.
Incisors (Teeth #6–11 upper, #22–27 lower)
Your 8 incisors are the thin, sharp teeth at the very front of your mouth. They’re designed for biting and cutting food. Central incisors are the two middle front teeth; lateral incisors are right beside them.
Canines (Teeth #6, #11, #22, #27)
Also called cuspids, your 4 canine teeth are the pointed ones. They’re the strongest teeth in your mouth and are used for tearing and ripping food. They’re also the last primary teeth to fall out.
Premolars / Bicuspids (Teeth #4, #5, #12, #13, #20, #21, #28, #29)
Your 8 premolars sit between your canines and molars. They have a flat surface with two cusps (hence “bicuspid”) and are used for crushing and chewing. They have no baby tooth equivalent — they replace the primary molars.
Molars (Teeth #2, #3, #14, #15, #18, #19, #30, #31)
Your 8 permanent molars (not including wisdom teeth) are your biggest, strongest teeth. They have a wide, flat chewing surface with multiple cusps and do the heavy lifting of grinding food down before swallowing.
Wisdom Teeth / Third Molars (Teeth #1, #16, #17, #32)
Wisdom teeth are the last teeth to emerge, typically in the late teens or early twenties. Many people don’t have enough room for them and need them extracted. Not everyone develops all four — some people have fewer, and some have none at all.
Other Tooth Numbering Systems
Palmer Notation System
The Palmer Notation system divides the mouth into four quadrants and uses numbers 1–8 for permanent teeth or letters A–E for primary teeth, paired with a symbol indicating which quadrant. It’s commonly used in the UK, orthodontics, and oral surgery.
FDI (Two-Digit) System
The FDI World Dental Federation system uses two-digit numbers. The first digit (1–4 for permanent, 5–8 for primary) indicates the quadrant; the second digit (1–8) indicates the tooth position within that quadrant. For example, tooth 11 is the upper right central incisor; tooth 36 is the lower left first molar. This system is the international standard used outside the US.
Fun Dental Facts: Teeth
- Tooth enamel is the hardest substance in the human body — even harder than bone.
- You start life with 20 primary (baby) teeth already formed in your jawbone before birth.
- Your teeth are unique — no two people have identical dental records, which is why dental records are used for identification.
- The average person spends 38 days brushing their teeth over a lifetime.
- Tree twigs were the first toothbrushes, used thousands of years ago.
- Blue whales, despite being the largest animals on Earth, have no teeth at all.
- Teeth cannot repair themselves — unlike bones, once tooth enamel is damaged, it cannot regenerate.
- You have two complete sets of teeth in a lifetime — but your permanent teeth need to last 60–80+ years!
How to Keep Your Teeth Healthy by Number
Once you know your tooth chart by number, you can have much more informed conversations with your dentist about which specific teeth need attention. Here are the most important oral hygiene habits to protect every tooth on your chart:
- Brush twice daily for at least two minutes — make sure you reach your back molars (#1–3, #14–19, #30–32)
- Floss daily to clean between teeth where brushes can’t reach
- Visit your dentist every 6 months for cleanings and X-rays
- Wear a mouthguard if you grind your teeth — molars and premolars are most vulnerable
- Limit sugary and acidic foods that erode enamel
- Drink fluoridated water to help remineralize enamel
Getting Kids Started with Good Dental Habits
Building great brushing habits early protects both the baby teeth on your child’s chart and the permanent teeth that come after. Making dental care fun is one of the best ways to get kids excited about brushing.
hum Kids Electric Toothbrush by Colgate
Your child can brush their teeth while playing games that will help them brush better with this kids’ battery toothbrush.
Timer and Extra-Soft Bristles
Featuring a toothbrush timer, hum kids’ electric toothbrush makes seriously good oral care something to smile about with fun augmented reality game experiences and challenges that help improve brushing. The toothbrush timer can be changed within the app to suit the preference of the parent and child. The extra-soft toothbrush bristles provide a gentle and effective clean. This kids’ toothbrush is recommended for children ages 5+.
How to Use
Ready for your child to enjoy brushing? Get started — Download hum kids by Colgate App → Launch the App → Place your smartphone in the phone holder → Position your child in front of the phone (with the screen facing your child) → Follow onboarding instructions in the App → Connector boot will automatically connect to the hum kids brushing game.
Frequently Asked Questions About Tooth Numbering
What tooth is number 14?
Tooth #14 is the upper left first molar in the Universal Numbering System. It’s one of the most commonly filled and crowned teeth because it does significant chewing work.
What tooth is number 30?
Tooth #30 is the lower right first molar. Like tooth #14, it’s a heavy-duty chewing tooth and one of the first permanent molars to erupt, typically around age 6. It’s also one of the most common teeth to need a root canal.
How many teeth do adults have?
Most adults have 32 permanent teeth, including 4 wisdom teeth. However, many people have their wisdom teeth removed, leaving 28 teeth total. Some people are born without one or more wisdom teeth entirely.
What are the four wisdom teeth numbers?
In the Universal Numbering System, wisdom teeth are #1 (upper right), #16 (upper left), #17 (lower left), and #32 (lower right).
What tooth is number 19?
Tooth #19 is the lower left first molar — one of the strongest teeth in your mouth and a critical chewing tooth. It typically erupts between ages 6–7.
What is the difference between primary and permanent tooth numbering?
Primary (baby) teeth use letters A–T, while permanent teeth use numbers 1–32 in the Universal system. This makes it easy for dentists to distinguish between child and adult dental records at a glance.
Why do dentists call out numbers during an exam?
When your dentist calls out numbers and letters during an exam, they’re recording the condition of each tooth using the tooth number chart. They may note things like cavity depth (measured in millimeters), presence of fillings, crowns, missing teeth, or areas of concern for each numbered tooth.
For more detailed dental health information and official tooth charts, visit the American Dental Association (ADA) website.
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