The dentin on the other hand could also catch stains. Many stains when allowed for a long period of time could get into the dentin forming stains that could show through the enamel. Other factors which could easily get through the enamel to the dentin are cracks in the teeth suffered through a trauma to the tooth, grinding, aging and other accidents. The paste can be used as well in the bleaching and at the same time best used when maintaining that shiny white teeth. 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. More concentration of the bleaching agents however means faster results compared to home treatment methods that are very much "watered down" to insure safety. Some of the risks that are likely to occur are sensitivity to touch, temperature and pressure. For persons with sensitive teeth though, toothpastes containing potassium nitrate are recommended. The dentist will always give the best advice, treatment and service, and it is recommended that even for simple cosmetic enhancements there must at least be a professional consultation. 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. While superficial stains and discoloration could be removed by prophylactic cleaning and brushing, there are stains that are a little more stubborn and could accumulate between the spaces of the tiny cracks in the tooth that would need bleaching to remove the stains. 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. In many cases, in just one visit the expected results can be seen immediately. But if the intent is to get that dramatic results in the form of shiny white teeth, then the person will need a number of visits to the dentist. And each of these visits will tend to lasts from 30 to 60 minutes. For a clearer picture on how the process is done, the following is the listing of the step-by-step procedure of this teeth whitening procedure.