An oxidizing agent consisting of hydrogen peroxide compounded with urea which releases oxygen in contact with water. It has the chemical formula: CH6N2O3. In dentistry it is used as a bleaching agent. For home use it is usually in a 10–20% solution dispensed as a gel. Pure carbamide peroxide is soluble in water and contains approximately 35% hydrogen peroxide: it is a skin, eye, and respiratory irritant and can cause corrosive burns on contact with the gingivae or mucous membranes. See also bleaching.