What is the primary purpose of fluoride varnish in pediatric dentistry?

• A. Desensitization
• B. Whitening
• C. Disinfection
• D. Remineralize enamel and prevent caries

Answer: (D)

The main concept this question tests is how fluoride varnish protects teeth by strengthening enamel and preventing caries. Fluoride varnish delivers a high amount of fluoride directly to the enamel, which promotes remineralization of early demineralized lesions and makes the enamel more resistant to acid attacks by forming fluorapatite. The varnish adheres to the tooth surface and releases fluoride over time, providing a sustained protective effect between visits, which is particularly valuable in young children who may have higher caries risk. This approach is focused on preventing decay and promoting mineral gain, rather than whitening the teeth or sterilizing surfaces. Desensitization targets nerve sensitivity, and disinfection implies killing microbes, neither of which is the primary action of fluoride varnish.