Crowns of all the permanent teeth, with the exception of the third molars, are calcified by the age of:

 # The crowns of all the permanent teeth, with the exception of the third molars, are calcified by the age of:

A. 6 years

B. 8 years

C. 10 years

D. 12 years

The correct answer is B. 8 years.

Reference: First AID for NBDE Part 1, 3rd edition 2012, Page 660