It is necessary to root planing. First of all, you need to understand the process of periodontal treatment. Periodontitis patients come to the hospital and need periodontal scaling, subgingival scraping, root planing, and in more severe cases, surgery. The periodontitis treatment process is called periodontal sequence therapy, and root planing is a step in the periodontal sequence therapy. Scaling is a supragingival scaling procedure used to remove calculus and plaque buildup from the gum surface. Subgingival scaling is used to remove calculus and plaque from below the gums. Root surface planing is used to remove contaminated bone from the root surface of the tooth. Periodontal subgingival scraping and root planing are necessary to completely remove bacterial microorganisms and contaminated bone from the root surface of the teeth. Studies have shown that subgingival debridement is more common, while subgingival scraping and root planing are more focused on subgingival debridement. Once upon a time root planing was utilized to level the root surface and make the root surface of the tooth clean and smooth. But nowadays, it is more common to choose to clean the root surface of the tooth thoroughly without removing too much bone, which facilitates tissue regeneration and restoration. Subgingival scraping and root planing are indispensable in patients with periodontitis.