If the patient has severe periodontitis and the calculus not only accumulates excessively on the gingiva, but also has most of it inside the subgingival gum wrapping, then it is necessary to use the magnetic telescopic minimally invasive scaling machine for combined supra-gingival and subgingival treatment, and after the machine treatment, if there is still residue, it is necessary to perform manual scaling under local anesthesia so as to completely remove calculus in order to relieve the patient’s periodontal disease symptoms and reduce gum bleeding. In addition, patients with calculus should undergo regular dental cleanings or periodontal treatment every six months to a year to help relieve periodontal disease and ensure the effectiveness of periodontal treatment.