Ultrasonic removal of concrements (dental stone) and pigmentation is painless method which should be performed every 6 months,( 2 times a year), and in some patients and more frequently. Also, it is done polishing of teeth with abrasive polishing paste and brush and air blasting with a special tool.
The purpose of regular cleaning of plaque  is to maintain a healthy periodontium (the supporting tissue around the tooth), thereby extending its lifetime as well as the overall oral health. If not performed regularly may come to periodontal inflammation, which initially manifests as gingivitis (inflammation of the gums) and then continues in parodontitis (inflammation of the surrounding periodontal complex) and later losing of teeth.