Scaling is also known as gingival scaling, its main role is to remove calculus, pigment, plaque, itself does not have the role of whitening, only to restore the original color of the teeth, if the existence of fluoride, tetracycline, etc. should be used to cold light whitening or veneer repair. Scaling is mainly through the use of ultrasonic scaler cavity principle will be attached to the teeth on the thick calculus from the teeth, calculus contains a large number of bacteria, which in the long run can easily lead to gingivitis, periodontitis and thus lead to gum recession. Therefore, scaling is essentially a method of removing foreign pigmented calculus, but also a method of relieving gingivitis and periodontitis, general scaling is recommended once every six months to once a year. If the teeth themselves exist tetracycline teeth, dental fluorosis simple scaling can not become white, this time need to do cold light whitening or veneer repair. After scaling the calculus from the teeth, there may be a short period of hot and cold sensitivity of the teeth, but also feel a gap between the teeth, these are normal phenomena, so scaling can not play a role in whitening.