Define S-ECC.

• A. Any sign of smooth-surface caries in a child younger than 3 years old
• B. Any sign of smooth-surface caries in a child older than 3 years old
• C. Any cavitated dentin lesion in a child younger than 4 years old
• D. White spot lesions in a child younger than 2

Answer: (A)

Severe Early Childhood Caries is defined as any sign of smooth-surface caries in a child younger than 3 years. This targets caries appearing on smooth surfaces (not just pits or fissures) in very young children, because such signs indicate an unusually aggressive decay process that requires urgent attention. The age threshold and the focus on smooth surfaces are what make this the best description. The other options miss the essential age limit or the specific surfaces involved, or they narrow the scenario too much (for example, cavitated dentin lesions or white spots in slightly older or younger kids).