The primary dentition in human differs from permanent dentition in not having one of the following types of teeth:

Step-by-step solution

The dental formula of human adult (permanent dentition) I C P M I C P M = 2123 2123 The dental formula of the child (primary dentition) I C P M I C P M   =   2102 2102 So premolars and third molar (last molar) are absent in primary dentition.