Calculus is an irritant present around the teeth and is a local promoter of periodontitis. A lot of plaque can be attached to the calculus, and this allows the plaque to irritate the periodontal tissue and form periodontitis. Therefore, it is important to remove the calculus as soon as possible to prevent the occurrence of periodontitis. In the mouth of a patient with periodontitis, there is usually a large amount of calculus present. It is also due to the stimulation of this calculus that periodontitis occurs. Periodontitis is a disease of the soft tissues surrounding the teeth and is formed by plaque acting on the teeth and irritating the periodontal tissues, the initiating factor of periodontitis is plaque. Plaque is a local promoter of periodontitis, which provides a place for plaque to colonize the teeth, thus facilitating plaque to stimulate periodontal tissues and form periodontitis. For the treatment of periodontitis, the main thing is to remove the plaque and calculus and other irritants. If you simply rely on brushing, it is not possible to remove the calculus, you need to use a periodontal therapy device, which uses ultrasonic shock to remove it, so as to benefit the health of periodontal tissues. It is very important to prevent the occurrence of calculus, to develop good habits of brushing, to maintain good oral hygiene, to go to the hospital for regular checkups, and to remove the calculus in time once it is found, so as to benefit the oral health.