A system and method for tooth whitening are disclosed wherein at least oneperoxide-containing gel and at least one transition metal compound- containinggel, particularly at least one lower atomic number transition metal compound,more particularly at least a ferrous compound including gluconate, sulfate,nitrate, acetate or mixtures thereof, are applied to a patient's mouth.Gelling agent is also included. The activation of the peroxide whitens thepatient's teeth. The system may be used with or without the application oflight. The system further provides an additional gel including a sensitivityreduction compound including potassium nitrate, sodium nitrate or mixturesthereof for possible sensitivity treatment if needed.
