The word “scaling” has long been no stranger to the people, but in addition to the pursuit of oral cleaning, why do dentists recommend people to clean their teeth at least once a year? As we all know, tooth decay (i.e. tooth decay) and periodontal disease (often manifested as bleeding brushing, loose teeth, etc.) are the two main oral diseases that plague human beings, both of which are mainly due to plaque bacteria. Because some people do not have good oral hygiene habits, do not brush their teeth in the morning and evening or do not brush in the correct way, the food residues in the mouth and the inherent flora in the mouth will combine together to form plaque on the surface of the teeth. If not cleaned in time, plaque will combine with calcium and phosphorus ions in human saliva to calcify into tartar, both of which are the culprits of most toothaches, bad breath, bleeding gums, loose and falling teeth, etc. For plaque and tartar that have already formed, brushing is powerless. The main purpose of periodontal scaling is to remove plaque, tartar and pigment deposited on the surface of teeth at the junction of teeth and gums, so as to remove local pathogenic factors and stop the development of gum damage and restore it to a relatively healthy state. Scaling, not only maintains oral hygiene, but also removes stains from the tooth surface and restores the natural color of the teeth. However, it should be noted that scaling is different from bleaching in that it does not remove the pigments inside the teeth and does not really make the teeth white. Pregnant women should receive thorough oral treatment prior to pregnancy because scaling during pregnancy (especially in the first and second trimesters) can greatly increase the probability of miscarriage. In developed countries, scaling has become a very popular routine oral health care, and people regularly visit their own dentists once or twice a year for scaling. After the scaling, if periodontal disease is found, the dentist will promptly perform oral specialty treatment to maintain oral health. Scaling is a highly specialized and technical job that requires rigorous training to perform. In the dental hospital medical staff using manual instruments scaling, it takes three to four hours or more, is the use of ultrasonic scaling machine scaling, also takes more than an hour. According to the patients, in some dental clinics or beauty salons, it only takes 10 minutes to clean the teeth. Practice has proven that scaling in irregular places is very harmful. 1, only to remove the visible tartar, but left the strongest pathogenic effect of the deep tartar, not to achieve the purpose of preventing periodontal disease. 2, damage to the gums, especially for the removal of tartar after the exposure of the roots of the teeth can not be further professional treatment in a timely manner, which not only leads to unbearable pain, but also aggravates the condition of periodontal disease. 3.It is very easy to cause cross infection and bring undue regret to people. Therefore, the place for scaling should be carefully chosen and you should go to a regular hospital to find a strictly trained medical staff to clean your teeth.