In Japan, application of APF gel (9000 ppm) is common for children. There is a long history of development of a policy and
guidelines for fluoride use in Japan. In most of the prefectures and municipal cities, there are health programs involving the use of fluorides. Most (70-80%) of the children aged 4 years and above have received topical fluoride applications. In addition, SDF solution is used in dental clinics to arrest dental caries in children.