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SEM images (×5000) of bovine enamel in the study groups; (A) Unbleached enamel: enamel rods with keyhole appearance can be seen in transverse section. (B) Enamel bleached with 35% carbamide peroxide: the enamel rods have lost their integrity. (C) Enamel treated with 10% sodium ascorbate subsequent to bleaching with 35% carbamide peroxide: a network of sodium ascorbate adsorbed to the bleached enamel surface can be seen. (bar: 5 µm).
