Dentition

Over the course of our lifetime, we generally develop 20 primary teeth, followed by 32 permanent teeth.

Teeth are divided into four categories:
  • INCISORS
  • CANINES
  • PREMOLARS
  • MOLARS

The first teeth that come in during childhood are the incisors. In the lower jaw, they appear between the ages of 6 and 10 months, and in the upper jaw, between the ages of 7 and 12 months.

All 20 primary teeth come in by the time a child is 2 or 3 years old, and some of them remain until the child reaches age 12.

Dentition

Eruption and loss of primary teeth

UPPER JAW ERUPTION LOSS
Central incisors Central incisors Between 7 and 12 months Between 6 and 8 years
Lateral incisors Lateral incisors Between 9 and 13 months Between 6 and 8 years
Canines Canines Between 16 and 22 months Between 10 and 12 years
First molars First molars Between 13 and 19 months Between 9 and 11 years
Second molars Second molars Between 25 and 33 months Between 10 and 12 years
LOWER JAW ERUPTION LOSS
Second molars Second molars Between 20 and 31 months Between 10 and 12 years
First molars First molars Between 13 and 19 months Between 9 and 11 years
Canines Canines Between 16 and 23 months Between 9 and 12 years
Lateral incisors Lateral incisors Between 7 and 16 months Between 7 and 8 years
Central incisors Central incisors Between 6 and 10 months Between 6 and 8 years

Eruption of permanent teeth

UPPER JAW ERUPTION
Central incisors Central incisors Between 7 and 8 years
Lateral incisors Lateral incisors Between 8 and 9 years
Canines Canines Between 11 and 12 years
First premolars First premolars Between 10 and 11 years
Second premolars Second premolars Between 10 and 12 years
First molars First molars Between 6 and 7 years
Second molars Second molars Between 12 and 13 years
Third molars (wisdom teeth) Third molars
(wisdom teeth)
Between 17 and 21 years
LOWER JAW ERUPTION
Third molars (wisdom teeth) Third molars
(wisdom teeth)
Between 17 and 21 years
Second molars Second molars Between 11 and 13 years
First molars First molars Between 6 and 7 years
Second premolars Second premolars Between 11 and 12 years
First premolars First premolars Between 10 and 12 years
Canines Canines Between 9 and 10 years
Lateral incisors Lateral incisors Between 7 and 8 years
Central incisors Central incisors Between 6 and 7 years

Adults have:

8

incisors


4

canines


8

premolars


12

molars including 4
wisdom teeth