What causes gum bleeding when brushing teeth?

The main reasons for gum bleeding when brushing are toothbrush too hard or incorrect brushing, dental calculus stimulation, vitamin deficiency, periodontal disease, systemic diseases, etc. 1. toothbrush too hard or incorrect use of a toothbrush, or brushing too hard, horizontal brush, etc., may damage the gums, causing bleeding. The correct brushing method should be to gently brush up and down along the teeth. 2. Dental calculus irritation Dental calculus is a hard substance deposited on the tooth surface, such as plaque and soft dirt. It can irritate the gums, causing inflammation, redness, and bleeding during brushing. Long-term dental calculus irritation may also cause more serious periodontal disease. 3. Vitamin deficiency When the body lacks nutrients such as vitamin C, it may affect the health of gingival tissue, making it fragile and prone to bleeding, but this situation is relatively rare. 4. Periodontal disease This is a common oral disease. When inflammation occurs in periodontal tissues such as gums, periodontal ligament and alveolar bone, gums will become fragile and prone to bleeding. Early may only be manifested as gingival bleeding, if not treated in time, will gradually lead to tooth loosening or even loss. 5. Systemic diseases such as thrombocytopenia purpura, leukemia, hypertension, etc., may also lead to gingival bleeding easily. This kind of situation is often accompanied by abnormal performance of other parts of the body, which requires high attention and timely medical examination and diagnosis.