Background: Teeth staining is one of the esthetic problems faced by dentists and patients. Many methods have been suggested as crowns, restorations and bleaching. Dental bleaching effectiveness depends on many factors including technique and materials.Objectives: Studying the effect of diode laser 940 nm and light emitting diode (450-505) nm in bleaching of stained teeth regarding : whitening efficiency; pulp temperature; surface roughness and topography.Materials and Methods: 40 extracted anterior teeth divided into 6 groups immersed at 37 o C in either tea; coffee; cola ; juice for 14 days, tobacco stained teeth as well as control group were also included ( immersed in distilled water ). These groups were subdivided into laser group or light emitting diode group bleached according to manufacturer specifications. Shades of teeth were recorded before and after bleaching. Furthermore, temperature changes during bleaching were recorded using thermocouple Thermometer. All specimens were examined under light microscope, Atomic Force Microscope and Sectioning Electronic Microscope to study the surface roughness and topography.Results: the light emitting diode group yielded slight significant whitening efficiency with more pulp temperature rise (3.4 ºC) compared to the laser group (1.4 ºC). Both groups showed non-significant effect on roughness and topography compared to control group. Conclusion:Although light emitting diode group showed slightly significant shade improvement, but the increase in pulp temperature was greater than that of laser group indicated better prognosis and safety when diode laser 940 nm used. Conducting between efficiency and preservation, diode laser is superior in safety and slightly similar whitening efficiency.