This study investigated the effect of light-curing of Clearfil DC Bond (DC Bond) on the micro-tensile bond strength of Clearfil Esthetic Cement to dentin. Extracted human teeth were used in this study. The coronal dentin surfaces were prepared, and treated with DC Bond with or without light-curing, or ED primer II according to the manufacturer's instruction and luted composite block using Clearfil Esthetic Cement. The bond strengths were measured with the micro-tensile bond test. The bond strengths were statistically compared with ANOVA and Duncan's new multiple range tests. The debonded specimens and resin-dentin interfaces were also examined by SEM. There were no significant differences in bond strength among all the groups. In the SEM observations, no morphological differences were found among all the groups. For all fractured surfaces in the debonded DC Bond with light-curing group, cohesive failure in resin was observed. Adhesive fracture was predominantly observed in the debonded DC Bond without light-curing group. The cohesive failure in resin was predominantly observed in the debonded ED primer group.<BR>In conclusion, although the type of fractured surface for the DC Bond without light-curing group differed from that for the DC Bond with light-curing group, there was no significant difference in the dentin bond strength of Clearfil Esthetic Cement between the two groups.