There are many common diseases related to teeth and their corresponding causes, such as dental caries, pulpitis, periapical infection, gingivitis, periodontitis and periapical infection of wisdom teeth, which are very common diseases in clinical practice. Most of these diseases are caused by bacterial infections, for example, dental caries, pulpitis and periapical periodontitis are different stages of development of a disease, which are caused by the infection of dental caries to the hard tissues of the teeth and develop step by step. In the case of gingivitis and periodontitis, the presence of a large number of bacteria in the periodontium leads to the inflammation of the periodontium and causes the final loosening of the tooth. In wisdom tooth pericoronitis, the inflammation is caused by the congenital lack of space for the eruption of the wisdom tooth on the one hand, and by the invasion of bacteria into the area corresponding to the wisdom tooth pericoronary on the other hand. For these diseases, it is recommended to go to the professional stomatology department for treatment as soon as possible, and it is also recommended to go to the professional stomatology department for scaling treatment every six months to a year, in addition to treating periodontal diseases, scaling can also play a better role in detecting and preventing caries and pericoronitis.