If you are looking for solutions to improve the looks of your teeth, then chances are you have come across the porcelain veneers. These products are often marketed not just to correct uneven tooth alignment but these veneers are also looked at as something that can whiten your teeth. Originally, these veneers are used on the surface of the tooth in order to correct uneven teeth. And the differences between the two categories are assessed using the following measures: Composition and the strength of the bleaching agent used. It is an accepted fact that the over the counter medications and formulations will contain less concentration of the bleaching agent. In many products, the concentration will only reach up to 10 percent. Additional application of fresh bleaching gel could be opted depending on the development of the treatment and how the teeth have whitened. The gel is then rinsed off or suctioned and the cheek retractor is removed. Immediately afterwards, the teeth will be several points lighter than its natural color. 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. And the use of toothpaste will be recommended. This is needed so that the person will not experience sensitivity. These procedures are not for everybody; there are some restrictions and once you have checked these then you can always retry the services of teeth whitening. And what are these limitations? Consider the list below, and be guided accordingly. These procedures are not best for those below 16 years of age. 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.