Mild dentin conditioners have been recommended to modify the smear layer to increase bond strength. The purpose of this study was to evaluate the effect of different dentin conditioning agents on tensile bond strength of composite resin to dentin surface using self etch adhesive system. Materials & Methods: The roots of forty freshly extracted sound human molars were cut beyond DEJ, occlusal surface of each tooth carefully trimmed. Prepared samples were randomly divided into four groups (10 each): Gp I control gp applying self etch adhesive and composite, Gp II 25% Polyacrylic acid application followed by the same steps as gp I, Gp III 2.5% (NaOCl) application followed by adhesive and composite and Gp IV using 0.5 M (EDTA) and also followed by adhesive and composite application. Tensile bond strength of samples was tested. Determine mode of failure of debonded samples under a stereomicroscope confirmed with scanning electron microscope. Results: Gp IV recorded the highest tensile bond strength values while the lowest tensile bond strength values were found at Gp III. ANOVA test was used to compare the four tested groups at a level of significance P < 0.001. conclusion: The surface treatment of dentin before bonding positively affect the tensile bond strength values.