Fluoride Varnish Mechanism — ORE Part 1 MCQ
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Correct answer: D — It releases fluoride to strengthen enamel and promote remineralisation
Sodium fluoride varnish acts principally as a topical fluoride source. It remains on the tooth surface after application and releases fluoride, strengthening enamel and favouring remineralisation; this makes teeth more resistant to caries. **A** is therefore correct. **B** describes a fissure sealant, which is a resin-based physical barrier placed in susceptible pits and fissures. **C** is incorrect because fluoride varnish is not intended to sterilise the mouth. **D** describes a cosmetic effect unrelated to fluoride varnish. **E** is too narrow: fluoride varnish may sometimes be used to help sensitivity, but its principal preventive role is caries control.
Reference: Scottish Dental Clinical Effectiveness Programme (SDCEP), Prevention and Management of Dental Caries in Children: Professionally-delivered interventions, accessed July 2026. https://www.childcaries.sdcep.org.uk/guidance/caries-prevention/professionally-delivered-interventions/