Chemin K, et al. - Researchers assessed the risk for and intensity of tooth sensitivity and colour change of at-home dental bleaching with 4% and 10% hydrogen peroxide (HP). Findings suggested the effectiveness of at-home bleaching with 4% and 10% HP concentrations. Experts noted 10% HP to increase the absolute risk and intensity of tooth sensitivity during at-home bleaching. For both groups, data from change in the number of shade guide units and colour variation after one month of bleaching demonstrated notable whitening, with no difference between groups.