Plaque is a colorless, soft, unmineralized colony that adheres to the tooth surface, and is relatively easy to remove because it has not yet formed mineralized calculus. Clinically, the best way to remove plaque is to brush mechanically. Dentists recommend brushing once a day after meals, which means at least three times a day, for no less than three minutes each time. Brushing should be done with a horizontal chattering barbarian method, each time with a short horizontal chattering, for the gingival sulcus, with a 45 degree angle between the brush head and the long axis of the teeth, and for the labial occlusal surface and the lingual surface of the teeth. For the adjacent spaces of the teeth that are difficult to be brushed by toothbrushes, they should be better cleaned with dental floss and gap brushes. Generally, this cleaning method of our daily physical friction can remove most of the plaque in the mouth. For the tartar formed due to long-term plaque deposition, we suggest to go to the professional dentistry department every six months to a year for dental scaling treatment, which is also called supragingival scaling, and it is a process to thoroughly clean the tartar and dental bacteria in the mouth through the method of ultrasonic joint sterile water rinsing. By insisting on applying the right method every day, brushing and cleaning at the right time, and scaling every six months to a year, the plaque in the mouth can be better controlled.