In children under 5, when should clinicians prescribe oral fluoride supplementation?

• A. Prescribe oral fluoride supplementation starting at birth if water is deficient.
• B. Prescribe oral fluoride supplementation starting at age 6 months for children with fluoride-deficient water.
• C. Do not use fluoride supplements until age 6 years.
• D. Only for children with existing cavities.

Answer: (B)

The main idea is that fluoride supplementation in young children is a preventive measure reserved for when a child’s drinking water is deficient in fluoride, and the appropriate starting age is about 6 months. Beginning supplementation at 6 months aligns with when the first primary teeth are developing and erupting, allowing systemic fluoride to help reduce caries risk during early dentition. Starting at birth isn’t recommended because of safety concerns and lack of need for fluoride exposure so early. Delaying until age 6 misses a critical window for prevention, and giving fluoride only to kids with existing cavities ignores its preventive benefit. Therefore, starting at around 6 months for children with fluoride-deficient water is the best choice.