Silver and stannous fluorides in prevention and treatment of caries and tooth erosions Caries and dental erosions involve major challenges in dentistry. In addition to removal of causal factors (sugars and acids), in the man-agement of those conditions, silver and tin (stannous) fluorides have recently received much attention. Silver diamine fluoride has proved effective for arresting and prevention caries. Stannous fluoride has been of particular interest in the prevention of dental erosions. This paper provides an overview of proposed mechanisms of action and available data on clinical effectiveness for these two metal fluorides.