This option can come in two variants, the one with carbamide peroxide or the one with hydrogen peroxide. The bleaching formulation products will often come complete with the custom-fitted tray so that will be used by the dentist to get an impression of the teeth of the person. When this treatment option is considered, the treatment may be performed for as short as 30 minutes to as long as 8 hours. What To Remember When Shopping For Teeth Whitening Paste Many studies have it- teeth whitening pastes that are available in the supermarket works and are safe. And when used properly, say twice daily the expected effect by the person can be realized in as a short as two weeks. And everyone can even increase the chance of being in the safe side if they can shop for the whitening tooth paste that is approved by the American Dental Association. Right now there are advances in the technology that allows for the teeth to become whiter at a shorter period of time. These new products contain blue covarine. So how safe is the teeth whitening toothpaste? The good news is that this product is safe for everyday use. But when abused, then this can bring damage to the teeth than joy. What it contains are silica for example and some aluminum and calcium that will be enough to remove stains but not really to counter the natural discoloration of the teeth as it ages nor does it contain substances that react with the mineral structure to whiten a dark colored teeth. Second, most tooth bleaching agents such as gurgles and gels contain peroxide. 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. Unlike teeth whitening trays that are designed by a dentist or a licensed practitioner to fit personalized requirements, the strips are for general use and therefore are designed to address every possible requirement without causing discomfort. There is no risk to using dental strips, however if the person wants a whitened teeth as soon as possible which could meet particular expectations, the dentist is irreplaceable.