Tooth whitening is the procedure in which a rubber dam is applied to your teeth to preserve the gums, and a bleaching product is painted onto your teeth. Then laser or light is shone on the teeth to activate chemicals. The laser light fastens up the reaction of the whitening product, and the color change can be achieved rapidly. In other words, it is the process of bleaching the tooth professionally. The 'active ingredient' in the product is traditionally carbamide peroxide or hydrogen peroxide. As the active ingredient is broken down, oxygen gets into the varnish on the teeth, and the tooth color is made lighter. This procedure is short and can be performed by any midtown clinic, and it is a little time-consuming as there are minimal steps involved in tooth whitening. The process hardly takes three to four weeks to complete and for the patient to get a healthy and sparkling smile.