The Chairside Instructor 4 Tooth Development: Primary Teeth Oral Anatomy Primary Teeth Early Childhood Upper Teeth Erupt Shed Central incisor 8-12 mos. 6-7 yrs. Lateral incisor 9-13 mos. 7-8 yrs. Canine (cuspid) 16-22 mos. 10-12 yrs. First molar 13-19 mos. 9-11 yrs. Second molar 25-33 mos. 10-12 yrs. Lower Teeth Erupt Shed Second molar 23-31 mos. 10-12 yrs. First molar 14-18 mos. 9-11 yrs. Canine (cuspid) 17-23 mos. 9-12 yrs. Lateral incisor 10-16 mos. 7-8 yrs. Central incisor 6-10 mos. 6-7 yrs. Adult teeth start to form under the baby teeth. Adult teeth Baby teeth Every mouth is different. Teeth may come in/fall out earlier or later than what’s shown in this chart.