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When a cosmetic dentist indulges in whitening of teeth of a patient then it is called professional tooth whitening. Dentist in London are said to be the best cosmetic dentists in the world. These procedures are very effective and very accurate. For whitening, dentists use procedures like bleaching. Nowadays Lasers are also being used in order to have efficient and instantaneous results. In the bleaching technique, the patient is applied with a gel with contains bleach at the areas where the whitening is to be done. The bleach contains peroxide which cleans the stains and helps in the whitening process of the teeth. The cavities in the mouth should be properly medicated and the gums should be properly filled before applying the bleach. Not doing so can harm the roots and the gums of the teeth. The bleach applied does its work in an hour or two depending upon the stain. More number of stains and stronger stains take more time to be get cleaned. In laser process laser is applied after applying the gel to fasten the process. But professional help must be taken in order to have effective and safe results.