Eruption of 1st molar permanent tooth occurs at the age of:: (A) 4-5 years, (B) 6-7 years, (C) 7-8 years, (D) 8-10 years
Answer is B. b. 6-7 years(Ref: Nelson's 20/e p 1768-1771, Ghai 8/e p 11)Permanent dentition begins at 6 years and is completed by 12 years (except for 3rd molar).