<prompt> Primary dentition begins to show teeth eruption by-6 weeks12 weeks6 months12 months  <response>: Ans. is c i.e., 6 months o Primary dentition begins to show teeth eruption at 6 month of age which to lower central incisor while calcification started at 3 month of age and crown completed at 4 month of age.o Permanent teeth1st molar 6-7 yearsCentral and lateral incisor 6-8 yearsCannine and premolar 9-12 years2nd molars 12 yearsThird molars 18 years and laterDeciduous teeth Upper LowerCentral incisor7 12 Month6 12 MonthLateral incisor8 Month7 MonthCannine16-20 Month16-20 Month1st molar12-16 Month12-16 Month2nd molar20-30 Month20-30 Month 