Gum bleeding is one of the common symptoms in dentistry and refers to small amounts of bleeding from the gums either spontaneously or due to minor irritation. In mild cases, it is manifested as blood in the saliva only when sucking, brushing, or chewing harder foods, while in severe cases, it bleeds more or even spontaneously when the gums are slightly irritated. What are the causes of gum bleeding? 1, periodontal disease When lesions occur around the teeth, the main symptom is gingival edema, inflammation, neovascularization and expansion, once chewing or brushing, can often cause bleeding. If periodontal disease develops into alveolar abscess or tooth loosening, gum bleeding is more likely to occur. 2, systemic diseases such as blood system diseases, diabetes, cardiovascular disease, liver and kidney function abnormalities, tumors, etc.. The pathogenic way is usually to make the immunity of the whole body decrease, which in turn leads to the decrease of resistance to local stimulation, inducing gum inflammation, coagulation system disorder, organic changes of blood vessels, changes of blood flow dynamics, etc. 3.Stimulation of cavities After dark brown cavities are formed in the teeth near the gums due to tooth decay, the edges are uneven and sharp, which often stimulate the gums to ulcerate and cause bleeding. 4.Change of endocrine Under the influence of elevated sex hormone and progesterone hormone, the gum tissue is slightly stimulated to trigger non-specific inflammation, resulting in gum bleeding, increased exudation and gum hyperplasia. Examples include adolescent gingivitis, gingivitis during pregnancy and gingival tumors. How to prevent gum bleeding? 1. Insist on brushing your teeth in the morning and evening. Patients with gingivitis should choose to brush their teeth with medicated toothpaste. It is best to buy several different medicated toothpastes with hemostatic effect and use them alternately, preferably with different brands. 2, after each meal and at night to rinse the mouth, gingivitis patients can use mouthwash, to kill most of the pathogenic bacteria in the mouth and periodontal, as well as the role of fresh breath. 3, every day should use dental floss (preferably after each meal and before going to bed at night), the gap between the teeth is too large should also use the gap brush, remove the tooth surface and periodontal dirt and food debris, to prevent the formation of tartar and calculus. 4, regular hospital scaling is a very important dental care method, generally once every six months to a year. In case of periodontal disease, systematic periodontal treatment should be carried out.