Both baby and permanent teeth have fairly well-defined times of eruption. The ages listed are the typical ages that an adult tooth has fully emerged. UPPER and LOWER. ERUPTS BY. Central incisor. 7th Yr. Lateral incisor. 8th Yr. Canine (Cuspid. 11-12th Yr. First premolar (Bicuspid. 9th Yr. Second premolar(Bicuspid. 10th Yr. First molar. 6th Yr. Second molar. 12-13th Yr. Third molar. 17-25th Yr. Update Date: 05/28/2008Jason S. Baker, DMD, Oral and Maxillofacial Surgeon, Private Practice, Yonkers, New York. Review provided by VeriMed Healthcare Network.