primary dentition

central incisors 

6 months

primary dentition

lateral incisors

9 months 

primary dentition

canine  

18 months

 primary dentition

1st Molar 

12 months 

primary dentition

2nd molar

24 months

permanent dentition

 Lower central incisor

6 years

 permanent dentition

Lower lateral incisor

 years 

permanent dentition

Lower canine

11 years

permanent dentition

Lower 1st molar 

6 years

permanent dentition

Lower second molar 

12-13

permanent dentition

Lower 1st premolar

11 years 

permanent dentition

Lower 2nd Premolar 

12 years 

permanent dentition

Lower third molar 

17-25 years

permanent dentition

upper central incisors

7-8 years 

permanent dentition

upper lateral incisor

8 years 

permanent dentition

upper canine

12 years 

permanent dentition

upper 1st premolar 

11 years

permanent dentition

upper second premolar

12 years

permanent dentition

upper 1st molar

6 years 

permanent dentition

upper 2nd molar

12-13 years

permanent dentition

upper 3rd molar

17-25 years 

localised causes of delayed eruption 

congenital absence

crowding

delayed exfoliation of primary predecessor

supernumerary tooth

dilaceration

abnormal position of crypt

priamry failure of eruption 

Generalised caues of delayed eruption 

rickets

down's syndrome

cleft lip and palate

cleidocranial dystosis

hereditary gingival fibromatosis