Learn By Enamelly Editorial Team September 8, 2026 Updated September 8, 2026

Teeth numbers chart: how the 3 numbering systems work

teeth numbers chart reference: plaster dental model of upper and lower adult teeth on a clinic tray

The Universal system numbers your 32 adult teeth 1 to 32, starting at the upper right wisdom tooth and finishing at the lower right one. FDI notation uses two digits, quadrant first and tooth second, and Palmer notation counts 1 to 8 in each quadrant. The chart below maps every tooth across all three.

Three systems, one set of teeth

Universal numbering is what most US dental offices and insurance forms use; the American Dental Association (ADA) lists it as the standard in its coding materials. The FDI two-digit system, published by the FDI World Dental Federation and adopted as ISO 3950, is the default across most of the rest of the world.

Palmer notation survives mainly in orthodontics and in UK practice. All three describe the mouth from the dentist’s side of the chair, so “right” means your right, which sits on the left of any chart drawn facing you.

Video: Study With The Dentist

Teeth numbers chart: all 32 adult teeth

Read Palmer as quadrant plus position: UR1 is the upper right central incisor. On paper, Palmer uses a bracket symbol around the number instead of letters, and the letter form here is the standard text substitute.

Universal (ADA) Tooth FDI / ISO 3950 Palmer
1 Upper right third molar (wisdom tooth) 18 UR8
2 Upper right second molar 17 UR7
3 Upper right first molar 16 UR6
4 Upper right second premolar 15 UR5
5 Upper right first premolar 14 UR4
6 Upper right canine 13 UR3
7 Upper right lateral incisor 12 UR2
8 Upper right central incisor 11 UR1
9 Upper left central incisor 21 UL1
10 Upper left lateral incisor 22 UL2
11 Upper left canine 23 UL3
12 Upper left first premolar 24 UL4
13 Upper left second premolar 25 UL5
14 Upper left first molar 26 UL6
15 Upper left second molar 27 UL7
16 Upper left third molar (wisdom tooth) 28 UL8
17 Lower left third molar (wisdom tooth) 38 LL8
18 Lower left second molar 37 LL7
19 Lower left first molar 36 LL6
20 Lower left second premolar 35 LL5
21 Lower left first premolar 34 LL4
22 Lower left canine 33 LL3
23 Lower left lateral incisor 32 LL2
24 Lower left central incisor 31 LL1
25 Lower right central incisor 41 LR1
26 Lower right lateral incisor 42 LR2
27 Lower right canine 43 LR3
28 Lower right first premolar 44 LR4
29 Lower right second premolar 45 LR5
30 Lower right first molar 46 LR6
31 Lower right second molar 47 LR7
32 Lower right third molar (wisdom tooth) 48 LR8

How each system counts

Universal begins at 1 on the upper right third molar, runs across the upper arch to 16 on the upper left, drops down to 17 on the lower left, and ends at 32 on the lower right.

FDI gives every quadrant a digit: 1 is upper right, 2 upper left, 3 lower left, 4 lower right. The second digit counts outward from the central incisor (1) to the third molar (8), so 46 is read “four-six”, the lower right first molar.

Palmer uses the same 1 to 8 count as FDI but marks the quadrant with a bracket rather than a digit, which reads well on a hand-drawn chart.

Baby teeth get their own labels

The 20 primary teeth are never numbered 1 to 20. Universal uses the letters A to T, starting at the upper right second molar. FDI keeps its two-digit logic but moves to quadrants 5 through 8, so a child’s upper right central incisor is 51.

Palmer marks primary teeth A to E per quadrant. Letters on a pediatric chart are expected, not an error.

Where the numbers show up in your own records

A chart note reading “watch 30” or “watch 46” points at the same tooth: the lower right first molar. First permanent molars erupt around age six, which is why dentists call them six-year molars and check them closely for early decay. If a note flags early demineralization there, our teeth remineralization guide explains what that stage means and what the evidence supports.

Numbering also helps you describe sensitivity precisely. “Cold hurts on 8 and 9” tells a dentist far more than “my front teeth”, and it makes it easier to judge whether a remineralizing ingredient fits your case; start with what hydroxyapatite is if that term appears on your product label.

Several early lesions listed by number on one chart is also the moment to talk to your dentist before switching to a fluoride-free toothpaste, since that choice depends on your individual caries risk rather than on the paste alone. This page is general information, not dental advice.