When do your teeth erupt into your mouth? Can we use them to tell how old you are?

1. Timeline of
Dental Eruption
Copyright © Dr Anna Williams and Victoria Churchill, 2015

2. 0 months
Upper jaw
(maxilla)
Lower jaw
(mandible)

3. 6 - 9 months
Upper jaw
(maxilla)
Lower jaw
(mandible)
Deciduous or
‘baby’ or
‘milk’ incisors
erupt at
about 6 – 9
months

4. 12 months
Upper jaw
(maxilla)
Lower jaw
(mandible)
The
deciduous
first molars
erupt at
around 12-
14 months

5. 16-18 months
Upper jaw
(maxilla)
Lower jaw
(mandible)
The ‘baby’
canines erupt
at about 16 -
18 months

6. 3 years
Upper jaw
(maxilla)
Lower jaw
(mandible)
Second molars
erupt at around
3 years
At 4 years old,
all deciduous
teeth are
present

7. 6 years
Upper jaw
(maxilla)
Lower jaw
(mandible)
Permanent
or adult first
molars erupt
at around 6
years old

8. The adult
lower incisors
erupt between
6 and 7 years
6-7 years
Upper jaw
(maxilla)
Lower jaw
(mandible)

9. Adult upper
incisors erupt
between 7 and
8 years
7-8 years
Upper jaw
(maxilla)
Lower jaw
(mandible)

10. 10 years
Upper jaw
(maxilla)
Lower jaw
(mandible)
Premolars
erupt at about
10-12 years
Lower adult
canines erupt
at about 9
years

11. Upper adult
canines erupt
between 11-12
years
11-12 years
Upper jaw
(maxilla)
Lower jaw
(mandible)

12. The second
adult molars
erupt at 11-
13 years of
age
12 years
Upper jaw
(maxilla)
Lower jaw
(mandible)

13. 18 years
Upper jaw
(maxilla)
Lower jaw
(mandible)
The “wisdom”
teeth or third
adult molars
erupt at about
18 years old,
but sometimes
do not erupt at
all