For millions of people who face significant barriers to conventional dental care — children too young or frightened to tolerate drilling, adults with cognitive or physical disabilities, and elderly patients in care facilities — the prospect of a topical liquid that arrests tooth decay without a drill changes the calculus of preventive dentistry entirely. Silver diamine fluoride (SDF) may represent one of the more underutilized tools in modern oral health.
This narrative review, drawing on 74 articles retrieved from PubMed, Cochrane Library, and Ovid Medline — spanning randomized clinical trials, systematic reviews, meta-analyses, and qualitative studies — examined SDF's dual role as both a caries-arresting and caries-preventive agent. The compound, a combination of silver ions (antimicrobial) and fluoride (remineralizing), was found effective for both cavitated and non-cavitated carious lesions. The review emphasizes its particular value for populations who face disproportionate difficulty accessing or tolerating operative dental procedures, including those in remote communities.
SDF has been cleared in several countries, including the United States (FDA-approved in 2014 as a desensitizing agent, with widespread off-label caries use), yet adoption remains inconsistent. The mechanism is well-characterized: silver ions disrupt bacterial cell membranes and inhibit enzymatic activity in cariogenic biofilms, while fluoride promotes hydroxyapatite remineralization. The primary clinical limitation — irreversible black staining of arrested lesions — continues to drive patient hesitancy and clinician reluctance, particularly for anterior teeth. Newer formulations combining SDF with potassium iodide aim to reduce this cosmetic issue, though efficacy trade-offs are still being studied.
As a narrative rather than systematic review, this analysis carries the inherent limitation of potential selection bias in article inclusion. Nonetheless, the convergence of randomized trial data and meta-analytic evidence in the included literature lends meaningful weight to its conclusions. For health-conscious adults thinking beyond their own care, SDF's equity implications — offering a low-cost, minimally invasive option for underserved groups — may prove its most important attribute.