There is no calculus is also the need for scaling maintenance, plaque attached to the gum edge or subgingival is the naked eye and can not be completely seen, but also need to be removed on a regular basis, it is recommended to go to the hospital for regular scaling. Calculus is plaque accumulated together for a long time mineralization formation, the oral cavity is a bacterial environment, there is no calculus, every day there will be bacterial growth, plaque adhesion. Daily brushing can brush off eighty percent of the plaque, the remaining will be attached to the teeth around, and may develop below the gums, destroying the gum attachment, leading to inflammation of the gums, damage to the alveolar bone, resulting in loose teeth. Scaling is the main way to remove plaque with ultrasonic shock or manually, and can also be done with a microscope for meticulous cleaning that can maximize periodontal health. It is recommended to have your teeth cleaned every six months to a year to ensure good oral hygiene.