There is a white bag on the gums, to determine whether it is very soft or hard. First, if it is hard, it is likely to be suffering from osteophytes of the alveolar bone. If the osteophytes themselves do not affect the normal physiological activities in the oral cavity, and do not scrape the tongue or the mucosa on the buccal side, they can be considered temporarily untreated. But the osteophytes, will often recur, if once it affects the oral activities, can also be timely alveolar bone trimming. Second, if the white bag is soft, it is likely to be an abscess, that is, suffering from periapical inflammation of the tooth, which may have a great caries on the surface of the tooth, or once had root canal treatment, but inflamed again. It is necessary to go to the hospital for root canal treatment or to take X-ray to determine whether there is root fracture in the tooth.