Comparative Evaluation of Bleaching Efficacy and Enamel Corrosion from Tooth Whitening Products with Varying Hydrogen Peroxide Concentrations

This study investigates the bleaching effectiveness and enamel corrosion potential of three commercially available tooth whitening agents with different hydrogen peroxide concentrations. Twenty extracted human teeth were divided into four groups, including one control group treated with saline and three experimental groups treated with whitening products containing 17%, 24%, and 40% hydrogen peroxide, respectively. Bleaching efficacy was evaluated using a standardized shade guide, and enamel surface changes were assessed via scanning electron microscopy. Results indicate that the 17% and 40% hydrogen peroxide products demonstrated superior whitening outcomes compared to the 24% product. However, the 40% agent caused more enamel erosion, while the 17% product exhibited minimal damage. These findings provide useful clinical insights for selecting safe and effective whitening products.