الفهرس 
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Abstract
60 extracted human premolars were used and divided mesiodistally into two halves (n=120). The samples were divided into two equal groups (n=60) ; GI ; intact group and GII: demineralized group. Each main group was divided randomly into three subgroups according to the type of fluoride varnish. Subgroup a : MI varnish, subgroup b: Enamel Pro varnish and subgroup c : Clinpro White varnish. The samples of GII were immersed in demineralizing solution for 96h to create artificial carious lesion. Application of fluoride varnishes respectively to all samples of GI and GII. The samples were examined by using stereomicroscope, scanning electron microscope and Vicker’s microhardness test. The samples of GI and GII were immersed again in demineralizing solution for 96h to evaluate the resistance to carious lesion. Stereomicroscope, scanning electron microscope and Vicker’s microhardness test were used again to evaluate the efficacy of remineralizing agents again. The data were collected and analyzed by using ANOVA test. Conclusions The current study showed that all remineralizing agents are capable to remineralize early carious lesions while Clinpro White varnish in GI was more effective in protecting the enamel surface from demineralization and Enamel Pro in GII was better than other varnishes in precipitation of calcium and phosphate at demineralized enamel surface.