Silver diamine fluoride, commonly referred to as SDF, is a liquid that can be brushed onto a tooth that has a cavity. This simple, quick and noninvasive treatment kills the bacteria that is causing and continuing the decay, preventing dental caries from becoming more extensive. SDF treatment is ideal for children and adults who do not want to have to get a cavity filled. It is especially beneficial on primary (baby) teeth that are going to fall out in a matter of months or years.