Bovine dental enamel blocks were obtained and artificially stained with the extrinsic pigments (n=50): SK, CF, RW or control (C). Afterwards, specimens were treated with the following bleaching protocols: LED, LED/CP, CP, LED/HP and HP. Color change (Delta E) was measured considering after staining (T0), 24 hours elapsed from bleaching (TB) and 7 days after treatments (T7) times by means of digital spectrophotometry. Data was tested by two-way ANOVA and Tukey's Test. Enamel's surface morphology after treatments was analysed under scanning electron microscope (SEM). Type of staining and bleaching protocols significantly affected bleaching outcomes (p<0.001). Regardless of the extrinsic pigment, LED promoted statistically greater Delta E for stained groups in comparison to C (p<0,05). LED alone promoted clinical perceptible Delta E, but in less extent than for gels. LED/CP Delta E was significanty greater than CP's for CF, RW and C (p<0.05). Equal Delta E was found for LED/CP and HP for all pigments (p>0.05), except for CF (p=0,020). Only CF led LED/HP Delta E to be significantly higher than HP (p=0.012). Seven days elapsed from bleaching, outcomes were mantained. SEM images revealed that topography of enamel bleached with gels suffered alterations, but this was not exacerbated by LED irradiation.