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The maxillary teeth generally erupt before their mandibular counterparts. Eruption of the incisors precedes that of the canines. The premolars and molars erupt last.

There are normally 26 deciduous teeth. Between 11 and 15 days, the incisors erupt; at 17–19 days, the canines erupt; between 24 and 30 days, all premolars erupt. The secondary (adult) upper first molars erupt later, between 37 and 60 days. At 60 days, the deciduous dentition is complete. By seven months, the permanent teeth should be fully erupted (Table 1.1).

Table 1.1 Approximate age by which permanent teeth erupt (in days).

	Upper	Lower
Incisors
Central	103	113
Middle	114	119
Lateral	135	132
Canine	153	149
Premolar
Second	150
Third	168	173
Fourth	151	174
Molar	162	130

Figure 1.36 Directions in the oral cavity.

Figure 1.37 Right maxillary and mandibular apical and coronal directions.

Illustration 1.2 Tooth anatomy and direction nomenclature.