Gum loss should refer to gum recession, not long generally because it is difficult to recover from gum recession, usually can only control its no longer continue to shrink. If you continue to shrink the situation may be improper brushing, chronic periodontitis, gingivitis and other primary disease has not been controlled, it is recommended to seek medical treatment in a timely manner. 1. Improper brushing: such as toothbrush is too hard, improper brushing method, too much strength, etc. may be long-term stimulation of the gums, which may lead to gum recession over time. 2. Chronic periodontitis: chronic infectious inflammation of the periodontal tissues, mostly caused by tartar, plaque, etc., which can be manifested as periodontal pockets, alveolar bone resorption, tooth loosening and other symptoms. When chronic periodontitis leads to alveolar bone resorption, the gums will lose support, which can appear gum recession. 3. Gingivitis: refers to the inflammation that occurs at the edge of the gums and gingival papillae, mostly caused by infection, malnutrition, etc., which can be manifested as bleeding, redness, swelling and pain of the gums, etc. As there are bacteria in the mouth of these patients, they may be affected by gingivitis. As such patients have bacteria in the mouth, soft dirt, teeth covered with stones, plaque, etc. when the gums can be compressed to cause its shrinkage. If gingivitis is left untreated, the gums may continue to shrink. It is recommended to brush your teeth in the correct way and if any of the above factors are present, you should seek medical attention for a clear diagnosis and appropriate treatment if necessary.