A. _Deciduous_:
1st incisor (Di 1) Birth or first week.
2nd „ (Di 2) 4–6 weeks.
3rd „ (Di 3) 6–9 months.
Canine (Dc )
1st premolar (Dp 2) Birth or first two weeks.
2nd „ (Dp 3) „
3rd „ (Dp 4) „
B. _Permanent_:
1st incisor (I 1) 2½ years.
2nd „ (I 2) 3½ years.
3rd „ (I 3) 4½ years.
Canine. (C ) 4–5 years.
1st premolar (or wolf tooth) (P 1) 5–6 months.
2nd „ (P 2) 2½ years.
3rd „ (P 3) 3 years.
4th „ (P 4) 4 years.
1st molar (M 1) 10–12 months.
2nd „ (M 2) 2 years.
3rd „ (M 3) 3½–4 years.
(The periods given for P 3 and 4 refer to the upper teeth; the lower
ones may erupt about six months earlier.)