Caneppele, T. M. F.; Torres, C. R. G.; Chung, A.; Goto, E. H.; Lekevicius, S. C. Effect of Photochemical Activation of Hydrogen Peroxide Bleaching Gel With and Without TiO2 and Different Wavelengths. Braz. J. Oral Sci. 2015, 9, 393-397.