If you are looking for a more powerful teeth whitening agent, look no further than carbamide peroxide teeth. In the market, you can find this being sold as Urea Peroxide, Urea Hydrogen Peroxide and Percarbamide. In some places, it is also known as the 22% concentration gel or 22 Carbamide Peroxide.
No matter what it is called, this bleaching agent is similar to hydrogen peroxide. A more powerful acid than hydrogen peroxide, this chemical should be used with extra care. Never let it come into contact with your skin.
At low concentration, it is perfectly safe but anything above 35%, you need to be wary.