Gums can be opened up may be related to the growth of wisdom teeth, may also be caused by some oral diseases, such as periodontitis, wisdom teeth pericoronitis, gingivoma, etc., should be timely consultation, to find out the cause of the disease. 1. Wisdom tooth growth: Wisdom teeth are prone to malposition or obstruction during growth. Some wisdom teeth are not fully exposed during growth, or partially contained in the gums, and then the gums may turn open. Usually after the wisdom teeth erupt completely, the symptoms can gradually improve. 2. Periodontitis: due to plaque biofilm caused by the periodontal tissues of chronic infectious diseases, patients can appear in the early stage of mild periodontal pockets and alveolar bone resorption, some patients may also appear loose teeth, so that the conscious gums can be turned, and severe cases can also occur acute periodontal abscess. 3. Wisdom teeth pericoronitis: refers to wisdom teeth in the process of eruption, occurs in the soft tissue around the crown of the septic inflammation. Wisdom teeth in the eruption of insufficient will form a blind pocket, when the wisdom teeth pericoronitis, can be seen in the local gingival flap congestion, swelling and overflow of pus in the blind pocket, so there will be the manifestation of gingival ectopia, some patients may also appear fever, tiredness and other systemic symptoms. 4. Gingival tumor: it refers to the growth of limited reactive growths on the gums, i.e. gingival tumor, when the gingival tumor is larger, the gums can be turned over. When ulceration occurs on the surface of the swelling, the patient can feel pain, and the larger gingival tumor can compress the alveolar bone. When the patient finds that the gums can be turned over, or when symptoms such as pain occur, the patient should consult the doctor in time for appropriate treatment.