Gums on one side of two hard bags may be bone protrusion or fistula, specific need to go to the hospital to check the periodontal situation. 1. Bone protrusion: when the teeth are extracted, if the alveolar spacing is too high or the alveolar fossa is not reset, the alveolar bone may be exposed in the later healing process and appear bone protrusion, which is hard and tingling when touched by hand. Need to be about three months after the extraction of bone repair. 2. Fistula: When the tooth appears chronic apical periodontitis, if the inflammation through the periosteum to reach the gums, without treatment in the gingival surface rupture can form a fistula, intraoral examination of the fistula with liquid oozing, visible dental disease. The inner side of the root of the tooth grows two hard bags, it is recommended to go to the hospital in time to check the dental periodontal situation, and timely treatment, to avoid affecting oral health.