Tooth numbering converter

Type any tooth number or pick a tooth. See it in FDI, Universal and Palmer, for adult teeth (32) and baby teeth (20).

Quick answer

FDI 16, Universal 3 and Palmer UR6 are the same tooth: the upper right first molar.

Convert a tooth

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FDI (16), Universal (3 or A to T) or Palmer with a quadrant (UR6). Or pick a tooth below.

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upper right

upper left

lower right

lower left

Maxillary right first molarupper right quadrant, upper arch

FDI: 16
Universal: 3
Palmer: UR6

Open the page for tooth 16

How the three systems count

FDI (World Dental Federation) uses two digits. The first is the quadrant: 1 upper right, 2 upper left, 3 lower left, 4 lower right (the patient's sides). Baby teeth use quadrants 5 to 8. The second digit counts from the middle: 1 is the central incisor, 8 the third molar. Tooth 16 is the upper right first molar. The World Dental Federation (FDI) two-digit tooth numbering system is used in all NDEB examinations.

Universal numbers adult teeth 1 to 32, starting at the upper right third molar, running across the upper arch to the upper left third molar (16), then down to the lower left third molar (17) and along the lower arch to the lower right third molar (32). Baby teeth use letters A to T in the same order. The Universal system is common in the United States.

Palmer writes the tooth number 1 to 8 (baby teeth A to E) inside a bracket that shows the quadrant. In plain text we write the quadrant first: UR6, UL3, LL8, LRA.

The AFK uses FDI. The AFK format page shows how the exam day runs and what the 200 questions cover.

Last checked 23 October 2026. Source: NDEB AFK Protocol 2026.

Quick answer: adult teeth

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

Quick answer: baby teeth

Show all 20 baby teeth

All 20 baby teeth in FDI, Universal and Palmer
FDI	Universal	Palmer	Tooth
51	E	URA	Upper right central incisor
52	D	URB	Upper right lateral incisor
53	C	URC	Upper right canine
54	B	URD	Upper right first molar
55	A	URE	Upper right second molar
61	F	ULA	Upper left central incisor
62	G	ULB	Upper left lateral incisor
63	H	ULC	Upper left canine
64	I	ULD	Upper left first molar
65	J	ULE	Upper left second molar
71	O	LLA	Lower left central incisor
72	N	LLB	Lower left lateral incisor
73	M	LLC	Lower left canine
74	L	LLD	Lower left first molar
75	K	LLE	Lower left second molar
81	P	LRA	Lower right central incisor
82	Q	LRB	Lower right lateral incisor
83	R	LRC	Lower right canine
84	S	LRD	Lower right first molar
85	T	LRE	Lower right second molar

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