All primary teeth would have begun to calcify by:

 # All primary teeth would have begun to calcify by:

A. 14 weeks of intrauterine life

B. 18-20 weeks of intrauterine life

C. 6 months of gestation

D. 6 months of age

The correct answer is B. 18-20 weeks of intrauterine life.

Calcification of the primary teeth begins in utero from 13 to 16 weeks postfertilization. By 18 to 20 weeks, all the primary teeth have begun to calcify. Primary tooth crown formation takes only about 2 to 3 years from initial calcification to root completion. However, mineralization of the permanent dentition is entirely postnatal, and the formation of each tooth takes about 8 to 12 years.

Reference: Wheeler's

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