### What is Silver Diamine Fluoride (SDF)? Silver diamine fluoride (SDF) is a liquid used by dentists to prevent tooth cavities from forming, growing, or spreading. It consists of silver, water, fluoride, and ammonia. SDF was first approved in Japan over 80 years ago and by the U.S. FDA in 2014. ### How is SDF Used? SDF is typically applied directly to the surface of the teeth. Most dentists use a solution containing at least 38% SDF. It is often used on areas affected by cavities but can also be applied to healthy teeth as a preventive measure. ### Benefits of SDF SDF is highly effective in stopping the growth of cavities and requires fewer treatments compared to traditional fluoride varnish. It is considered safe for use, even in young children. ### Side Effects The most common side effect is black staining around the treated area. SDF can also stain clothing and nearby tissues in the mouth. People with silver allergies, oral ulcers, advanced gum disease, or major tooth decay should avoid using SDF. ### Cost of SDF Treatment The average cost of an SDF application is around $75 per treatment, or $20–$25 per tooth. Some health insurance plans and Medicaid may cover the cost of SDF treatments. ### Conclusion SDF is a safe and effective alternative to traditional cavity treatments. While it may not be suitable for every case, it has proven to be highly successful in stopping the development and spread of cavities.