Dentition

Dentition is a term that describes all of the upper and lower teeth collectively.
Clinically, there are three dentitions.
The primary dentition consists of 20 teeth in all: ten upper and ten lower teeth. Primary teeth may also be called 'baby' teeth, deciduous, 'milk', or lacteal teeth. Primary teeth begin to appear at about age six months and are entirely replaced by about ages 12 - 13.
The mixed dentition is composed of both primary and permanent teeth. It commences with the eruption of the first of the permanent teeth at about age six, and ends with the loss of the last of the deciduous teeth at about the age of 12-13 years. The permanent dentition is composed of 32 teeth in all, 16 upper and 16 lower. Half of a dental arch (primary or permanent) is called a quadrant. The permanent teeth that replace deciduous teeth are call succedaneous teeth. (Succedaneous means literally, to replace. In dental science, permanent teeth that replace deciduous teeth are called successional teeth. Permanent molars, which replace nothing are called accessional teeth.)