Hydrogen peroxide and urea in equimolecular proportions.It acts by releasing hydrogen peroxide and oxygen in contact with moist surfaces.It is used as a tooth whitener, for the topical treatment of infections (skin and mucous membranes) and an ear wax softener. Since the last update we have not found published data about its excretion in breast milk. As it is a product which acts locally, the absorption of hydrogen peroxide is zero or minimal since it is metabolized by the peroxides and catalase of the tissues. Furthermore, hydrogen peroxide and urea are natural components of the body and even breast milk (Al-Kerwi 2005, Ross 1985, Atkinson 1980).