Bleeding from brushing and bad taste in the mouth are usually caused by inflammation of the gums, but of course sometimes blood system and digestive system diseases can also cause these symptoms. Tartar and plaque deposited on the teeth are the main causes of gum inflammation. Tartar is a calcified or calcifying plaque, and its formation is related to the following two factors: 1. Oral hygiene condition, brushing is the main measure to remove plaque, and the quality of brushing varies greatly from person to person. When brushing, the exposed surface of each tooth should be brushed inside and outside, and the total time of brushing should not be less than 3 minutes, so that the teeth can be considered well brushed. 2, saliva composition, tartar is mainly the deposition of calcium salts, some people have a high concentration of calcium salts in saliva, saliva in the gel-like protein exudation, oral environment alkaline, etc., can promote the formation of tartar. Since some hidden parts of the teeth are still not brushed, the formation of tartar is inevitable, which requires regular dental cleaning, ultrasonic dental cleaning is an important measure to remove plaque and tartar, and prevent gingivitis and periodontitis, but you can not rely on dental cleaning to maintain oral hygiene, generally about 6 months to a year can be carried out once. Scaling itself is not harmful to the body and teeth, but there may be a risk of cross-infection if the instruments are not sterilized during treatment, so it’s best to go to a regular oral health care facility.