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Objective To observe the efficacy of BISCOVER LV tooth liquid polish sealant and Tooth Mousse Den⁃ tal protective agent on mineralization around the orthodontic brackets during orthodontic treatment. Methods 60 teeth with bonded orthodontic brackets were randomly divided into three groups, experimental group, positive control group and negative control group, they were applied separately with tooth liquid polish sealant, Tooth Mousse and distilled wa⁃ ter. 3 groups were dipped into an artificial caries solution and an artificial saliva solution, cycling between them.90 days later,the changes of enamel surface around the brackets of all samples were detected by microhardness tester and scan⁃ ning electron microscope. Results One ⁃way ANOVA was used for statistical analyses, there was significant difference of the microhardness of acid etched enamel surface among the three groups (P < 0.05). Through the LSD ⁃t test, there was no significant difference of the microhardness of acid etched enamel surface between experimental group and posi⁃tive control group (P > 0.05), and there were significant differences of the microhardness of acid etched enamel surface in another two comparisons within the three groups (P < 0.05). A large number of deposits were found through scanning electron microscope on the dental enamel surface of the experimental group, which could make a better remineralization. Conclusion Both BISCOVER LV tooth liquid polish sealant and Tooth Mousse Dental protective agent can effectively prevent tooth enamel from demineralization around the bracket during orthodontic treatment, doctors can choose them in accordance with the compliance of the patient.