Dental calculus exists on the tooth surface at the opening of salivary gland, such as the lingual surface of mandibular anterior teeth, buccal surface of maxillary posterior teeth, the neck of teeth, and the tooth surface where oral mucosa can not move.
Dental calculus is a milky soft scale at first, which will gradually calcify and harden. It is composed of 75% calcium phosphate, 15% ~ 25% water, organic matter, manganese phosphate, calcium mineral acid and a small amount of potassium, sodium and iron, and it is yellow, brown or black. If you don't pay attention to develop good oral hygiene habits, even after thorough scaling, dental calculus can easily be deposited on the tooth surface again soon.
Extended data:
Related conditions of dental calculus:
1. Patients with active angina pectoris, myocardial infarction within half a year, uncontrollable hypertension, heart failure, etc. , should not receive routine tooth cleaning treatment.
2. Patients with local soft and hard tissue inflammation in the acute stage should wait until after the acute stage to wash their teeth to prevent the inflammation from spreading and spreading through the blood.
3. Patients with gingival malignant tumor should not receive routine tooth cleaning to avoid the spread of the tumor.
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