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. Not everyone though is a good candidate for teeth whitening. There are teeth conditions and stains that are resistant to bleaching. And the nice thing about this process to whiten the teeth is that the effects can be there for around two years. This means that you will not need another round of professional cleaning and whitening service for the next two years. When it comes to professional services, there are also those services that are referred to as more specialized, which means that there are added special services for you. 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. Unlike other teeth whiteners, the whitening is only on the aesthetic area and like all whitening products; it is kept in the mouth for a period of time. Customers use the plastic strips while watching television, working out, doing household chores or overnight. The usual active bleaching ingredient is carbamide peroxide. Anything that is put in the mouth will leave its mark trough forming a pellicle film over the teeth which initiated in the pores between the rods. While brushing rids most of the materials that are accumulating, not all of it is removed. Over the years, the accumulation of the debris forms layer upon layer of film that show eventually as stain. 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. The dentist or any professional is the one that will do the initial cleaning process. The dirt and the stains at the surface of the teeth will be removed, and will be primed up for the whitening session courtesy of the whitening toothpaste.