Purpose: The aim of this study was to evaluate the remineralizing potential of white tea and green tea pretreatment on microhardness of demineralized dentin. Materials and Methods: A total number of 21 dentin samples were divided into three main groups of 7samples each according to the utilized treatment after demineralization. In the first group, dentin samples were immersed in 10% white tea extract solution followed by casein phosphopeptide amorphous calcium phosphate application. In the second group, samples were immersed in 10% green tea extract solution followed by casein phosphopeptide amorphous calcium phosphate application, while in the third group ,casein phosphopeptide amorphous calcium phosphate(CPP-ACP) only was applied on dentin surface. Microhardness was evaluated at baseline, after demineralization and after treatment for all dentin samples. Results: Microhardness mean values results revealed statistically significant increase in all groups after treatment .The highest percent of change of microhardness was found in white tea group, followed by green tea, while the control group revealed the lowest percent of change. Conclusions: Tea extracts increased dentin microharness  when used before application of remineralizing agent. However, white tea extract showed better microhardness values indicating  stabilization of dentin collagen network resulting in functional remineralization.