Severe illness or other factors occurring during which period are most likely to cause hypoplastic defects in permanent central and lateral incisors?

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The initial nine months after birthThe first 24 months of lifeThe first 30 days after birthBetween the second and third years of lifeAfter the age of three years

Explanation

Hypoplastic defects in permanent central and lateral incisors typically develop due to severe illness or adverse conditions during the first nine months after birth, a critical period for enamel formation in these teeth.