Root tip bulge may be related to periodontal abscess, apical periodontitis, wisdom tooth pericoronitis and other reasons. 1. Periodontal abscess: bacterial infection can lead to local inflammation of periodontal tissues, when the local inflammation continues to progress, the pus can not be discharged in the local aggregation, an abscess can be formed, manifested as apical bulging meat bag. 2. Apical periodontitis: apical periodontitis in the septic phase, the root inflammation ooze can not flow out smoothly, only through the surrounding gingival fistula and sinus tract discharge, in the root of the tip of the meat bag. 3. Wisdom tooth pericoronitis: Inflammation of the wisdom tooth infection can spread to the first molar position, will also cause local gum swelling. It is recommended to go to the hospital in time to clarify the cause of the root bulge and standardize the treatment under the guidance of the doctor.