In recent years remineralisation of lesions and caries arrest treatment has gained acceptance in the practice of minimally invasive dentistry. It is also promoted as a part of basic oral health care.It has been reported that arresting dentinal caries in primary teeth is possible without restorative intervention.Silver diamine fluoride(SDF) is an inexpensive topical fluoride used in many countries to treat dentinal caries across the age spectrum. It is very effective in arresting active caries in primary teeth without restorative intervention and is useful in maintaining form without making the child apprehensive.