Which baby tooth is letter A?

Primary tooth A

Tooth A: Primary Upper Right Second Molar

In the Universal Numbering System, primary tooth A is the primary upper right second molar (primary maxillary right second molar). Its FDI (ISO 3950) designation is 55 and its Palmer designation is E in the upper right quadrant. It is a molar in the upper arch with typically 3 roots.

Universal: A
FDI / ISO 3950: 55
Palmer: E
Type: Molar
Arch & side: upper, right
Typical roots: 3

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Primary Upper Right Second Molar

Primary Maxillary Right Second Molar

Universal: A
FDI / ISO: 55
Palmer: E

Type: Molar
Arch & side: Upper (maxillary), right
Typical roots: 3 (varies between individuals)

Full conversion table

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Upper right

Universal	FDI	Palmer
E	51	A
D	52	B
C	53	C
B	54	D
A	55	E

Upper left

Universal	FDI	Palmer
F	61	A
G	62	B
H	63	C
I	64	D
J	65	E

Lower left

Universal	FDI	Palmer
O	71	A
N	72	B
M	73	C
L	74	D
K	75	E

Lower right

Universal	FDI	Palmer
P	81	A
Q	82	B
R	83	C
S	84	D
T	85	E