Subgingival scaling is somewhat painful. In periodontal treatment, mild periodontitis may be controlled simply by scaling, while in severe periodontitis, subgingival scaling is done after a week of routine scaling is completed. Subgingival scraping is a very important and indispensable step in periodontal treatment and includes both manual instruments and ultrasonic instruments. Ultrasonic instruments are relatively gentle and can cause irritation to the root surface of the tooth, but they are relatively insignificant and feel only slightly sore. The manual instruments have a distinct edge, as each doctor’s hand strength and technique are different, and can cause significant friction on the root surface and contact with the gums, resulting in significant pain, which is usually tolerable. During periodontal treatment, subgingival scraping is routinely done under local anesthesia, which is very comfortable and can now be done painlessly.