The idea is to provide the customer with less messy, more convenient, least expensive but still provide effective whitening results compared to other teeth whitening home systems. Teeth whitening strips are very flexible, very easy to use thin strips of plastic coated with bleaching agents that stick to the teeth. 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. 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. The said whitening agent or formulation will then be allowed to stay on the teeth for the next 30 to 60 minutes. Again, the longevity of the process will ultimately depend on the manufacturer of the product or the whitening formulation. The moment that the intended shade of white has been achieved, then the teeth will be rinsed with water. 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. In fact it sparked controversies among dentists, but more to that later. Even as professionally supervised teeth whitening treatments contain hydrogen peroxide as its active bleaching agent that is safe enough even for home use, over the counter preparations contain carbamide peroxide which is even safer and milder.