How many sets of dentition are seen in human beings?
Human beings have 2 sets of dentition.
Primary dentition: Also called milk dentition or deciduous dentition.
Milk teeth or the primary dentition is the first set of teeth. The teeth start to erupt at an age of 6-7 months of the baby and by the age of 2 and half years all milk teeth would have erupted.
Milk dentition is active during the growing years of the baby and is gradually replaced by permanent teeth. So the last milk tooth to be replaced would be upper milk canine by permanent canine at the age of 12-14 years.
Secondary dentition: They comprise permanent teeth. These teeth have a longer life span. Permanent teeth are functional till the rest of life
The first permanent tooth that erupts in mouth is first molar at the age of 6 and gradually rests of the milk teeth are replaced by permanent teeth. This usually continues till the age of 12-14 years.
Permanent teeth are functional till the rest of life.