Tartar is also tartar and needs to be scaled to remove it and cannot be removed by yourself. Tartar, also known as tartar, is formed when food debris or soft tartar accumulates around the teeth after eating and is calcified by saliva. Tartar is closely linked to the teeth and once it forms, it is difficult to remove by itself, and in serious cases, it may cause damage to the teeth and needs to be removed by ultrasonic shock. Otherwise, it can cause gum bleeding and gingivitis or periodontitis. Tartar is divided into supragingival tartar and subgingival tartar. Supragingival tartar is visible to the naked eye and needs to be removed by ultrasound, and some can be removed by hand, but it may damage the teeth. Subgingival tartar cannot be removed by itself, it is attached to the root surface below the gums and needs to be removed by scraping with a manual instrument. After scraping, a root planing procedure is required, otherwise the tartar will reattach to the root surface. Subgingival tartar is very dangerous and can cause damage to periodontal tissues and in severe cases lead to loss of alveolar bone, resulting in loose teeth, and needs to be removed as soon as possible. Therefore, calculus is difficult to remove by itself and requires ultrasonic removal or subgingival scaling.