[Table/Fig-2]:

Chronology of tooth development

Maxillary (Upper) Teeth
Primary teeth	Central incisor	Lateral incisor	Canine	First molar	Second molar
Initial calcification	14 wk	16 wk	17 wk	15.5wk	19wk
Crown completed	1.5mo	2.5mo	9mo	6mo	11mo
Root completed	1.5 yr	2 yr	3.25 yr	2.5yr	3 yr
Mandibular (Lower) Teeth
Initial calcification	14 wk	16 wk	17 wk	15.5wk	18wk
Crown completed	2.5 mo	3mo	9mo	5.5mo	10mo
Root completed	1.5yr	2 yr	3.25 yr	2.5yr	3 yr

Maxillary (Upper) Teeth
Permanent	Central incisor	Lateral incisor	Canine	First premolar	Second premolar	First molar	Second molar	Third molar
teeth	3-4mo	10-12mo	4-5mo	1.5-1.75yr	2-2.25yr	At birth	2.5-3 yr	7-9yr
Initial calcification	4-5yr	4-5yr	6-7yr	5-6yr	6-7yr	2.5-3yr	7-8yr	12-16yr
Crown completed	10 yr	11yr	13-15yr	12-13yr	12-14yr	9-10yr	14-16yr	18-25yr
Mandibular (Lower) Teeth
Initial calcification	3-4mo	3-4mo	4-5mo	1.5-2 yrs	2-2.25yr	At birth	2.5-3 yr	8-10yrs
Crown completed	4-5yr	4-5yr	6-7yr	5-6yr	6-7yr	2.5-3yr	7-8yr	12-16yr
Root completed	9yr	10yr	12-14yr	12-13yr	13-14yr	9-10yr	14-15yr	18-25yr