For the formulation that are used by the professionals that conduct supervised teeth whitening procedures, the formulation for the peroxide may reach up to 43 percent and the strength of the bleaching agent will depend on the service provider. This is the reason why those wanting immediate effects will go for the supervised services of the dentist. Just like the ordinary mouthwash, you just need to swish the waster around the mouth for the next 60 seconds, and this should be done at least twice a day. Use this product for the next 12 weeks and you will see the results that you are looking for. Some users stand for the efficacy of these products. The effects are the same. While hydrogen peroxide acts faster, carbamide peroxide when left in the mouth for a time divides into urea and hydrogen peroxide that acts on the stains by the oxidation process. It gets into the spaces of the rods in the enamel of the tooth, lifts the stains and drains the stain out. After the initial consultation, the process of getting an appointment, finding the time and actually sitting in the dentist's chair is not always convenient besides there are a lot of conditions where it is actually more practical to get a teeth whitening kit and apply it at home where the person could save enormously on fees and time. This is the leading organization and entity that you would want to listen to with regards to any products related to dental care. They often select products that comply with their standards. And if the organization is to be consulted, it is best to ask for assistance from your dentist before buying impulsively. Even discounting this natural aging of the teeth, eating habits, food choices, medication, lifestyles, health conditions and many other factors will develop the tiny cracks in the enamel allowing debris to accumulate between the spaces staining the teeth. Extrinsic staining and intrinsic staining are the two basic types at which the teeth develop stains and discoloration.