Normally, we brush our teeth to remove food debris, plaque and soft scale. How effective is brushing and can you evaluate it yourself? Yesterday, I got a plaque detector, and tried it myself, and found that: the plaque in the adjacent space and the cervical part of the teeth is more difficult to clean, so these hidden parts are the key parts for brushing. Interested parents can also try it themselves. Sun Xu of Xuanwu Hospital of Capital Medical University will do a comparison of the effect before and after scaling one after another. Time is limited, here first.