Patient: Description of the condition (time of onset, main symptoms, hospital visited, etc.): The big tooth may have decayed and there is a big hole in the middle, which is so deep that you can touch the flesh inside with a toothpick. The cavity has been there for several years and the flesh inside can be touched with a toothpick. No I heard that it is painful to pull out the tooth, and I wonder if it can be filled. Zhuang Peilin, Department of Stomatology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University: If the cavity is too deep and leads to perforation of the pulp base, the treatment effect is poor, but if the pulp base is still intact, it is possible to preserve the tooth and restore its function through root canal treatment. It is recommended to consult the stomatology department as soon as possible to avoid delaying the treatment. Try to keep the tooth and do not extract it easily. Patient: But the cavity has been there for a long time and the polyp has grown into the tooth. Chuang Pei-Lin, Department of Stomatology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University: Therefore, it is necessary to consult a clinician for examination and treatment as early as possible. The polyp depends on the source: 1, if it is a periodontal polyp, the effect will be worse. 2, if it is a pulp polyp is a kind of chronic pulpitis, through the root canal treatment is usually very good; there is another situation is the gum polyp, gum polyp on dental treatment effect is not affected.