Abstract
Lots of studies of laser effects on caries prevention as well as inhibition of enamel demineralization have been reported, and clinical applications of laser for those opportunities are most popular in pediatric dentistry. Currently, Er: YAG laser was developed, and it may be useful for cavity preparation of children patiens, because air turbin is much enough to scare them. Suitable lasers for pulp therapy of deciduous tooth or young permanent tooth should be expected.