Extrinsic staining and intrinsic staining are the two basic types at which the teeth develop stains and discoloration. Extrinsic stains are developed in the surface of the teeth that resulted from the accumulation of food debris and color. 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. Since teeth whitening and bleaching are among the simplest cosmetic procedures and provided you do not have cracks crowns porcelain veneers, special teeth and gum conditions, home kits are advisable provided you start with a low mixture of bleaching agents and water. Peroxides that are sold over the counter have indications and recommendations for the mixture which you could use. 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. Even the permanent tooth that follows later invisibly white is cast. Through everyday wear and tear, the gaps between the rods fill up with debris, tannins and other coloration that stains it. Buy the desensitizing toothpaste. This is one good investment if you want to take teeth whitening seriously. This can be used before and after using the teeth whitening toothpaste. 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. For this set of bleaching agents, the usual recommendation is to use twice daily and the waiting time can reach two weeks before the effects can be realized. In terms of price, expect to pay $3 to $10 for teeth whitening toothpastes. And for other bleaching formulations, some over the counter products can fetch around $30. Besides, the results, no matter how diligently done, will never equal to in-office whitening where the procedure is conducted and is professionally supervised by a dentist. All cosmetic enhancements are subjective to the person. While companies are aiming to give superior results every time and is continuously working at providing such, customers could sometimes fall on the side the unsatisfied.