Labels:text | font | screenshot | black and white OCR: Permanent teeth. (a) The permanent arch; key identifies each tooth by corres- ponding number, followed by approximate eruption date. (b) Permanent teeth in occlusion. 1-UR third molar, 17 to 21 years 17-LL third molar, 17 to 21 years 2-UR second molar, 12 to 13 years 18-LL second molar, 11 to 13 years 3-UR first molar, 6 to 7 years 19 -- LL first molar, 6 to 7 years 4-UR second bicuspid, 10 to 12 years 20-LL second bicuspid, 11 to 12 years 5-UR first bicuspid, 10 to 11 years 21-LL first bicuspid, 10 to 12 years 6-UR cuspid, 11 to 12 years 22-LL cuspid, 9 to 10 years 7-UR lateral incisor, 8 to 9 years 23-LL lateral incisor, 7 to 8 years 8-UR central incisor, 7 to 8 years 24-LL central incisor, 6 to 7 years 9-UL central incisor, 7 to 8 years 25-LR central incisor, 6 to 7 years 10-UL lateral ...