Researchers show active ingredient in whitening strips damages dentin EXPERIMENTAL BIOLOGY Orlando, Fla. (April 9, 2019) – Americans spend more than a billion dollars on teeth whitening products each year. Although these products can make smiles brighter, new research shows that they might also be causing tooth damage. In three new studies, researchers found that hydrogen peroxide, the active ingredient in over-the-counter whitening strips, can damage the protein-rich dentin tissue found beneath...