Hydrogen peroxide

Topical hydrogen peroxide has antiseptic properties. Short-term use of low-concentration hydrogen peroxide mouthwash (eg 1.5%) does not adversely affect the hard or soft tissues of the mouth. However, higher concentrations (eg 30 to 35%), such as in tooth-bleaching products, can cause mucosal burns. Reversible hypertrophy of the papillae of the tongue can occur with continued use of hydrogen peroxide mouthwash.