What is the recommended amount of SDF solution to moisten the lesion?

• A. The smallest amount possible
• B. The largest amount possible
• C. A moderate amount
• D. No SDF at all

Answer: (A)

When applying SDF, you want the smallest amount possible to moisten the lesion. A tiny amount is enough to allow the silver and fluoride ions to contact and penetrate the demineralized dentin to arrest caries, without creating pooling or excess exposure that can stain adjacent soft tissues or waste product. Use a microbrush to deliver just enough SDF until the lesion is damp, not dripping. This approach balances effective arrest with minimizing unnecessary contact and potential staining, which is why the smallest amount is preferred.