If the cavity is empty in the middle and there are polyps inside that bleed easily, it is necessary to fill the cavity after decay removal, fill the cavity after root canal treatment, or extract the tooth, depending on the situation. 1. Filling after removing decay: when the middle of the cavity is empty, it means that there is a carious cavity, and the tooth has been decayed for a long time, due to the loss of local pressure on the side wall of the tooth, as well as the stimulation of the local long-term food congestion, the gums may appear to be hyperplasia, and the cavity has not yet reached the pulpal cavity after removing the decayed tooth tissue and filling it with resin. Under local anesthesia to cut off the hyperplasia of the gingival tissue can be. 2. Filling after root canal treatment: The polyp in the middle of tooth decay may also be pulpal polyp, the tooth decay reaches the pulp cavity for a long time, and the internal tissue of the pulp is proliferated, usually it is necessary to carry out root canal treatment to remove the infected material, eliminate the inflammation, and then fill with resin. 3. Tooth extraction: When the tooth has been decayed for a long time, the decay has penetrated the bottom of the pulp chamber, and the tooth can not be treated with root canal therapy, the tooth needs to be extracted. Tooth decay needs to be treated in the hospital immediately to avoid inflammation affecting chewing.