Primary Dentition Eruption Schedule 1
-Rule of four-
It is easy to see the pattern of eruption with this table.
Age
(in Months)		 Number of
Teeth Erupted		 Specific Teeth
7
11
15
19
23		 4
8
12
16
20		 Four mand.incisors
Four max.incisors
Four first molars
Four canines
Four second molars

Primary Dentition Eruption Schedule 2
This table is more detailed but then we can see another pattern of eruption.
"Mandibular before Maxillary"
Typical
Eruption Date
(in Months)		 -Eruption Sequence-
Maxillary Mandibular
6
7
7-1/2
9
12
14
16
18
20
24

Central Incisor
Lateral incisor

First molar

Canine

Second molar		 Central incisor
Lateral incisor


First molar

Canine

Second molar

Active eruption of teeth occurs after one-half of the root is formed.
Apex is fully developed two to three years after eruption.
Calcification of the roots is normally completed by the age of 3 or 4.


Permanent Dentition Eruption Schedule
Typical
Eruption Date
(in Years)		 Range
(in Years)		 -Eruption Sequence-
Maxillary Mandibular
6
6
6
7
7
8
10
10
11
11
12
12
20		 6-7
6-7
6-7
7-8
7-8
8-9
9-10
10-12
10-12
11-12
11-13
12-13
17-21
First molar

Central incisor

Lateral incisor

First premolar
Second premolar
Canine

Second molar
Third molar		 First molar

Central incisor

Lateral incisor

Canine
First premolar
Second premolar

Second molar

Third molar

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