When shopping for this product, do keep in mind that the crowns, the fillings and the veneers will not be affected by the whitening action of the paste. Complement the use of the whitening toothpaste with the services of professional teeth cleaner. This is something that you would like to do if you want to achieve the best results for your teeth. When using hydrogen peroxide for example, the concentration of the mix that is recommended at the back of the bottle should be adhered strictly if not less than what is recommended just to test it out. While studies have shown (Kugel et al) that the effect of peroxides at decreasing the tooth enamel is very insignificant, it nonetheless tends to make the teeth more sensitive for some time and when the proportion of the mix is on the strong side, the mix could result to painful gums and cause irritation to the surrounding tissues inside the mouth. However, the effects are very negligible. Aside from that, the saliva replaces tooth enamel that is lost if ever there is. Even for people who have tooth hypersensitivity and gums that could easily be irritated, the discomfort is readily remedied by gels and pastes containing fluorides or less frequent use of the whitening agents. But be reminded that this product will not work to change the natural color of the teeth that has been overly exposed to the fluoride during its development. In theory, what makes the teeth whitening toothpaste works are its major ingredients. These products may contain special abrasives and these are the ingredients that work to remove the dirt on the teeth. This option can come in two variants, the one with carbamide peroxide or the one with hydrogen peroxide. The bleaching formulation products will often come complete with the custom-fitted tray so that will be used by the dentist to get an impression of the teeth of the person. When this treatment option is considered, the treatment may be performed for as short as 30 minutes to as long as 8 hours. These are clear gels that contain a good concentration of peroxide- that main ingredient that facilitates teeth whitening. These gels are often applied to the surface of the teeth with the use of a small brush. Most of the gels that are available in the market will call for you to apply these gels at least twice a day and this should go on for the next 2 weeks.