If a patient has periodontitis, because periodontitis is the presence of tartar under the gums, the tartar is attached to the root surface of the teeth. Conventional scaling is not able to clean out this part of the tartar and plaque, so subgingival scraping and root planing are needed to remove the tartar and plaque. Subgingival scaling is less painful and does not require anesthesia. Patients with a low pain threshold can also take local anesthesia, but they should pay attention to the amount of medication used to avoid overdosing and causing discomfort. Subgingival scraping has a beneficial effect on the recovery of periodontal conditions, cleaning out the irritation and restoring the gums to a healthy state, reducing the depth of periodontal pockets, and leading to a better prognosis for periodontitis. However, subgingival scraping is not a permanent solution, and patients should also clean the soft subgingival tartar and plaque in a timely manner to avoid reattachment of calculus to the root surface.