Objective：To compare the residual dentinal surface following caries removal between Carisolv and conventional bur meth－ods using microhardness test. Methods：Ten decayed primary molars and ten permanent molars with dentinal caries but not involving the pulp were collected. All the teeth were sectioned into two parts along the center of the cavity. Carisolv system was compared with slow-speed bur in eliminating caries. Then microhardness test was performed on the floor of the cavity and the surrounding healthy dentin. Results：Primary teeth：there was no statistically significant difference in caries-affected dentine and healthy dentine after the two methods（P >0.05）. Permanent teeth：there was no statistically significant difference in caries-affected dentine after the two meth－ods（P >0.05）；statistically significant differences were observed in healthy dentine between the two methods（P=0.008）. Conclusion：Carisolv can remove caries efficiently and has similar mineralization of healthy dentine as conventional bur methods.