Tooth designation system / ISO 3950

Oral cavity = 00
Maxillar = 01
Mandibular = 02

Quadrant number = 1 to 4 in the permanent dentition and 5 to 8 in the temporary dentition
Tooth number in each quadrant:
1 = central incisor
2 = lateral incisor
3 = canine
4 = first premolar
5 = second premolar
6 = first molar
7 = second molar
8 = third molar

Permanent dentition

18 17 16 15 14 13 12 11 21 22 23 24 25 26 27 28
48 47 46 45 44 43 42 41 31 32 33 34 35 36 37 38

Primary dentition

55 54 53 52 51 61 62 63 64 65
85 84 83 82 81 71 72 73 74 75

QUADRANTS = 10, 20, 30, 40
Quadrant 10 (upper right) teeth = 18, 17, 16, 15, 14, 13, 12, 11
Quadrant 20 (upper left) teeth = 21, 22, 23, 24, 25, 26, 27, 28
Quadrant 30 (lower left) teeth = 31, 32, 33, 34, 35, 36, 37, 38
Quadrant 40 (lower right) teeth = 48, 47, 46, 45, 44, 43, 42, 41

SEXTANTS = 03, 04, 05, 06, 07, 08
Sextant 03 / teeth = 18, 17, 16, 15, 14
Sextant 04 / teeth = 13, 12, 11, 21, 22, 23
Sextant 05 / teeth = 24, 25, 26, 27, 28
Sextant 06 / teeth = 34, 35, 36, 37, 38
Sextant 07 / teeth = 43, 42, 41, 31, 32, 33
Sextant 08 / teeth = 48, 47, 46, 45, 44