Types of gum recession: 1, inflammatory gum recession is the most common in clinical practice, mainly manifested as red, swollen and painful gums, and bleeding is common when brushing teeth. 2, elderly gum recession is also known as physiological recession. As we age, more or less atrophy occurs, so that the roots of the teeth exposed, such as no discomfort does not require treatment; but if there is an abnormal sensitivity of the teeth to hot and cold temperature changes and acidic foods, or prevent eating, desensitization treatment is required. 3, systemic diseases caused by; such as diabetes, malnutrition, anemia, leukemia, malignant tumors, etc. will also cause gingival atrophy. 4, the sequelae left by certain oral surgery, need symptomatic treatment. Prevention of gum recession: 1, keep the oral cavity clean is the most effective way to delay gum recession, regular dental cleaning, flossing, and frequent tooth knocking is particularly important. 2, to develop good oral hygiene habits. Brush your teeth at least 2 times a day, and one before going to bed at night is essential. Adopting nightly or regular flossing is a better and more practical way to prevent gum recession. 3. Regular checkups to prevent and control inflammatory oral diseases. Periodontitis, calculus, mouth ulcers, gingivitis, gum abscesses, food embedding and poorly fitting dentures are all causes of gum recession and should be treated as early as possible. 4, treatment of gum recession caused by the elderly systemic diseases. Endocrine disorders can cause gum recession; anemia and lack of vitamin C can cause gum bleeding; diabetic patients are prone to oral inflammation; after curing the primary disease, gum recession will also improve. 5, away from environmental pollution. Such as arsenic, lead and other metal poisoning can lead to periodontitis, gum edema and gum recession, so you should pay attention to their work and living environment, avoid contact with toxic substances.