Home whitening This method uses a model of the user’s teeth to make a plastic tray that fits the person, and then a whitening agent (hydrogen peroxide) that is worn for a few hours a day, and the whitening effect becomes apparent after a few weeks. Most whitening products are applied at home by the user himself. There is no professional supervision and guidance around, which requires the user to know how to use this technique to whiten teeth. Cold Light Whitening Cold light whitening is a new whitening technology. It works by applying high-density bright light to the whitening material, which chemically whitens the teeth. The whole process takes about one hour and needs to be done in the clinic. So far, we have not had any patients feel any adverse reactions after teeth whitening. After whitening, patients sometimes experience a brief period of tooth sensitivity, which gradually subsides after a few days. Combined whitening The combination of cold light whitening and home whitening can achieve 12-15 color changes in most whitened diseased entries. Similar results can be achieved with home whitening alone, but over a longer period of time. These operations need to be done safely and effectively under the supervision of a dentist.