First of all, healthy people should understand that even our very healthy teeth are yellowish because our teeth are made up of dentin on the inside and enamel on the outside. The enamel is colorless and transparent, while the dentin itself is yellowish, so from this point of view, the teeth themselves are not white. However, if the patient finds that the teeth have become more yellow than the original color in daily life, then it is indeed possible that exogenous staining has occurred, for example, some people have some bad habits, often smoke, or he or she will have some eating with heavily colored food or special drinks, such as often drink tea, coffee, and not cleaned in a timely manner, then the corresponding smoke, tea stains, and pigmentation will be left on the surface of the teeth. on the surface of the teeth. In this case, what we can do is to insist on doing high quality brushing every day, and brush our teeth after each meal, which can better remove the exogenous staining. For the long-term retention of tobacco and tea stains, you should choose the sandblasting joint polishing method to remove, sandblasting is the use of high-pressure silica spray on the surface of the teeth, is a better way to remove exogenous pigmentation on the surface of the teeth, it is a better way to deal with the aesthetics of the teeth. The main purpose of scaling is not to remove the yellowish pigmentation on the teeth, but to remove the plaque and calculus from the periodontium, which is removed by ultrasonic vibration. Relatively speaking, scaling focuses more on the periodontal health of the teeth, while it is far less effective than sandblasting in removing exogenous staining. Sandblasting is relatively focused on the aesthetics of the teeth, but for some large rocks, sandblasting is not as effective as the treatment. Therefore, in clinical work, scaling combined with sandblasting and polishing is an overall treatment plan for overall periodontal health and aesthetics. Finally, for the teeth whitening that people often do now, there are generally cold light whitening, drug whitening and other methods, if the scaling and sandblasting is relatively less damage to the teeth, but whitening in most cases the application of peroxide, will cause some damage to the tooth and periodontal teeth. In general, there is no need to apply this method for patients who do not have special requirements for aesthetics, and even if you do, it is always recommended to go to a regular oral health care institution for application.