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. And these products will always contain chemicals. And it is the role of these chemicals to break down the stains taken down by the abrasives. Half of the reason why this product works can be linked to the proper use and application. It is recommended by oral health practitioners that this should be used twice a day. When the stains are not effectively removed and stays on the teeth for a period of time, this could penetrate deeper into the dentin which could require more involved methods. Those stains that form beneath the enamel are intrinsic stains. Previously, intrinsic stains are believed to be resistant to treatments although today most of it could be removed with close supervision from qualified professionals. It is an accepted fact that the over the counter medications and formulations will contain less concentration of the bleaching agent. In many products, the concentration will only reach up to 10 percent. 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. And depending on the attending dentist, the formulation may contain the hydrogen peroxide or the carbamide peroxide. Either way, it can be expected that the whitening effect can be achieved. There are some cases when light or the laser will be used. The light will act as the heating agent that will be used to activate the peroxide content in the whitening formulation. The use of this product will limit the sensitizing effects. What are listed above are some things that should be kept in mind when looking for a teeth whitening toothpaste. This is totally different from your ordinary toothpaste, and as such shopping for the product requires special considerations as well.