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. The first step is the polishing of the teeth with the use of the pumice. The polishing action is important as this will remove the plaque and dirt found at the surface of the teeth. Not all teeth whitening products have the same bleaching agent concentration as peroxides that are marketed whether the hydrogen or the carbamide variant ranges from 10% to 20% strength, sometimes beyond that. Shop wisely. The safest route is to choose a small bottle in the mid strength range and test it. And also do remember that if you are not helping yourself (think: smoking) then there is a big chance that the results will be delayed and may be minimal. Do take note that the bleaching action can be faster if you will also do your part in the teeth whitening process. It doesn't mean that if you fall in one of these situations, then you can no longer try teeth whitening. These rods while very tightly packed have microscopic gaps in between them. The density of the crystalline rods differs from individual to individual and explains the reason why some tooth enamel are tougher than another person's enamel. Nonetheless, all most all of us are born with bright shiny teeth. Peroxides when it gets in contact with the soft tissues inside the mouth will often give a tingling sensation that may not be pleasant to about half of the patients undergoing teeth whitening. Peroxides also have a taste that may be unpleasant to some. In any case though the taste is very bearable and the tingling sensation may be ticklish but the feeling is always a cleaner mouth afterwards. 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.