Closed curettage is applied in case of deep periodontal pockets (spaces between gums and a tooth, which become deeper due to the development of periodontitis). During the procedure of closed curettage, the flap of the gum is pulled aside, which makes it possible to clean the periodontal pocket, freeing it from deposits that cause the inflammation, e.g. remains of tartar colonised by bacteria. The inflammation can thus be eliminated and the wound can heal.

Afterwards root planing is performed in order to scale the top surface of the root, which may be affected by bacteria.

The advantage of closed curettage is fast healing of the post-surgical wound, minimal discomfort to the patient and good aesthetic effect.