The gum is a compound squamous epithelial oral mucosa, attached to the neck of the teeth and the edge of the alveolar process, normally pink, lustrous, tough, and does not bleed easily when touched and chewed, but bleeds easily only when the gums are inflamed as a manifestation of gingivitis. There are many causes of gingivitis, both local and systemic causes can cause gum bleeding: local causes include poor oral hygiene, plaque attachment, calculus, periodontitis, incorrect brushing posture gum injury, food impaction gingivitis, traumatic occlusion, irregular teeth, etc.; systemic causes include: adolescent gingivitis, gingivitis during pregnancy, drug gingivitis, vitamin deficiency, blood system diseases, immune system diseases, etc. Regardless of the cause of gum bleeding, early gingivitis is a reversible lesion with a good prognosis. It is recommended that we remove local irritants in a timely manner so that the inflammation disappears quickly and the gum tissue returns to normal, and that we insist on brushing our teeth every morning and evening, with correct posture, rinsing after meals, flossing, regular oral health care, and regular cleaning to control bacterial growth and plaque formation, maintain the efficacy and prevent recurrence .