What is the purpose of the 4-8 week re-evaluation period for SDF-treated lesions?

• A. To check if it is black or firm or needs re-application
• B. To schedule a full restoration
• C. To check patient satisfaction
• D. To re-evaluate gingival health

Answer: (A)

After applying silver diamine fluoride, the goal of the 4-8 week re-evaluation is to verify that the lesion has become arrested and to decide if another application is needed. The key signs of arrest are the lesion turning black and the surface feeling hard to the touch, indicating that decay activity has slowed or stopped and the dentin has become firmer. If you see both black color and a firm texture, the lesion has arrested and can be monitored, with re-treatment only if changes occur later. If the lesion isn’t black or isn’t firm, or still shows activity, a re-application of SDF or consideration of restoration may be required. This check is focused on monitoring arrest and deciding on next steps for treatment, rather than scheduling a full restoration, evaluating patient satisfaction, or assessing gingival health.