Tetracycline should be avoided from:: (A) 4 months to 8 years after birth, (B) 4 months in utero to 8 years after birth, (C) 4 weeks in utero to 8 years after birth, (D) 12 weeks in utero to 8 years after birth
Answer is B. Tetracycline when given from mid-pregnancy to 5 months of extrauterine life, the deciduous teeth are affected with discoloration. When given between 3 months to 6 years of age, they affect the crowns of permanent anterior dentition. They should be avoided from 4 months in utero to 8 years.