First of all, periodontitis can be prevented, and secondly, periodontitis early treatment effect is good, can make the lesion stop developing, periodontal tissue can be repaired to a certain extent, therefore, people should periodontal dental examination regularly, dental cleaning, through scaling can also be timely detection of the problem, so as to achieve early diagnosis and early treatment. Even the more advanced periodontitis can be better treated with systematic periodontal therapy. The treatment of more serious periodontitis is very tedious, both early, medium and late periodontal patients, the first step in the treatment of very critical is the local mechanical debridement treatment, it can also be said that the treatment of periodontitis is based on local treatment, it is the treatment of the cause of the disease so it is said to be the most effective, the first is to remove the tartar and a large number of bacteria above the gums and shallow gingival sulcus, and then remove the tartar in the periodontal pockets (i.e. buried beneath the gums attached to the root surface) and scraping away a large amount of diseased tissue of bacterial toxins within the periodontal pockets and on the surface of the diseased tooth roots. After these treatments, the redness and swelling of the gums can subside, the bleeding of the gums and the overflowing of pus from the periodontal pockets can disappear, so as to achieve the purpose of reducing the inflammation of the gums, stopping the resorption of the alveolar bone, controlling the development of the lesion, and preserving the teeth. Of course, the local treatment also includes many elements, such as adjusting the bite, aligning teeth, removing bad restorations, filling dental defects, repairing missing teeth, extracting the affected teeth that cannot be retained, fixing loose teeth, etc. Of course, the most crucial thing is that the patients themselves use toothbrushes, dental floss, interdental brushes and toothpicks for good local cleaning.