Repair and bleaching treatment. Repair treatment method is to grind except the part of the natural teeth, covered with artificial materials in corresponding place, its advantage is tooth-colored change significantly, the disadvantage is must to face grinding in addition to the natural teeth and dental pulp and wound complications. Tooth bleaching treatment is a kind of do not have to change the teeth color in addition to natural teeth grinding treatment, such as the recent many hospitals and dental clinics adopted by the cold light whitening technology is one of them, it is cold light irradiation by special cover on the tooth bleaching agent, to make it in a short period of time into the tooth hard tissue to achieve change color, the purpose of tooth hard tissue, its advantage is not damage operation treatment time about 30 to 45 minutes, but deficiency is due to the effect of bleaching, bleaching effect due to personal things will have different teeth.
