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There are three types of deciduous teeth that make up the primary dentition (Figure 1.7): incisors, canines, and molars (first and second). Table 1.1 details their notation (the code used by the dental profession to identify teeth), approximate eruption dates, and functions.

Figure 1.7 Primary dentition.

Source: From [1]. Reproduced with permission of Elsevier.

Table 1.1 Primary dentition (notation, approximate eruption dates, and functions).

Tooth	Notation	Approximate eruption date	Function
Incisors	(a & b)	6–12 months (usually lowers first)	Biting
First molars	(d)	12–24 months	Chewing
Canines	(c)	14–20 months	Tearing
Second molars	(e)	18–30 months	Chewing

Table 1.2 FDI World Dental Federation notation for deciduous (primary) dentition.

Patient’s upper right (5)	Patient’s upper left (6)
55 54 53 52 51	61 62 63 64 65
85 84 83 82 81	71 72 73 74 75
Patient’s lower right (8)	Patient’s lower left (7)

Table 1.2 details the FDI World Dental Federation notation for primary dentition, which is a charting system commonly used by dentists to associate information to a specific tooth; where the quadrant number is the first digit applied, and the second number identifies the individual tooth.