Dental Development

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

Adults have 8 incisors, 4 canines, 8 premolars and 12 molars, including 4 wisdom teeth. 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.

Eruption and loss of primary teeth

Upper jaw

Central incisors

Lateral incisors

Canines

First molars

Second molars

Eruption

Between 7 and 12 months

Between 9 and 13 months

Between 16 and 22 months

Between 13 and 19 months

Between 25 and 33 months

Loss

Between 6 and 8 years

Between 6 and 8 years

Between 10 and 12 years

Between 9 and 11 years

Between 10 and 12 years

Lower jaw

Second molars

First molars

Canines

Lateral incisors

Central incisors

Eruption

Between 20 and 31 months

Between 13 and 19 months

Between 16 and 23 months

Between 7 and 16 months

Between 6 and 10 months

Loss

Between 10 and 12 years

Between 9 and 11 years

Between 9 and 12 years

Between 7 and 8 years

Between 6 and 8 years

Eruption of permanent teeth

Upper jaw

Central incisors

Lateral incisors

Canines

First premolars

Second premolars

First molars

Second molars

Third molars (wisdom teeth)

Eruption

Between 7 and 8 years

Between 8 and 9 years

Between 11 and 12 years

Between 10 and 11 years

Between 10 and 12 years

Between 6 and 7 years

Between 12 and 13 years

Between 17 and 21 years

Lower jaw

Third molars (wisdom teeth)

Second molars

First molars

Second premolars

First premolars

Canines

Lateral incisors

Central incisors

Eruption

Between 17 and 21 years

Between 11 and 13 years

Between 6 and 7 years

Between 11 and 12 years

Between 10 and 12 years

Between 9 and 10 years

Between 7 and 8 years

Between 6 and 7 years