The teeth whitening process actually begins after Hydrogen Peroxide breaks down into Water (H2O) and Oxygen (O2). When using Carbamide Peroxide also known as Urea Peroxide, the Carbamide must first turn into Hydrogen Peroxide before it can break down into water and oxygen. Carbamide Peroxide contains the chemical, UREA which acts as a stabilizer and prevents it from breaking down so that it can...