Dental caries specifically ECC, remains a remarkable issue in certain parts of society, particularly those with low socioeconomic status and with scarce health care services. Techniques that promote less discomfort, such as the application of silver diamine ﬂuoride, should be preferred and considered. Treatment of the disease is needed as children with an active caries lesion in their primary dentition can also present with caries lesions in their permanent dentition. By arresting and preventing the progression of caries, SDF offers an intervening care path for young children for whom traditional restorative treatment is not instantly available nor unacceptable by the children. This book on SDF highlights the properties of SDF and clinical recommendations on its use, safety for clinicians, the pros and cons of SDF solution in the clinical use of young children.