Gum loss refers to gum recession, which may be caused by trauma or gingivitis, periodontitis and other diseases. 1. Trauma: If the patient brushes his teeth too hard in daily life or brushes his teeth in an incorrect posture, it will cause some wear and tear on the gums, which will lead to the phenomenon of falling gums. 2. Gingivitis: Gingivitis is mainly caused by localized plaque, including misaligned and crowded teeth, food impaction, bad restorations and other factors. Patients will have bright red or dark red gums, gum edge thickening and no longer close to the surface of the teeth and other symptoms, some patients will also be accompanied by localized swelling, itching, pain, bad breath and other symptoms. 3. Periodontitis: There are various causes of periodontitis, the main microorganisms, host reaction. The main symptoms of patients are bleeding gums, periodontal abscess and other symptoms, but also root surface caries, bad breath and other symptoms. Patients with symptoms of falling gums should consult a doctor in time to identify the cause of the disease and follow the doctor’s instructions.