When the back tooth has a big hole, firstly, the necrotic tooth tissue in the hole will be cleaned up, and then, according to the depth of tooth decay, we will choose filling repair, root canal treatment, extraction, and so on. 1. Filling and restoration: After the necrotic tissue in the hole is cleaned up and the nerve of the tooth is not exposed, filling and restoration is chosen according to the depth of tooth decay or filling after cushioning. 2. Root canal treatment: After the cavity is cleaned out of the necrotic tooth tissue, if the nerve is exposed, root canal treatment will be performed on the tooth first, and crown restoration will be carried out at a later stage to prevent the tooth from splitting. 3. Extraction: After the necrotic tooth tissue in the cavity is cleaned up, the caries reaches the apical part of the tooth, and the tooth has little significance to be retained, it is best to extract the tooth, and then carry out dental implant restoration or other prosthetic restoration. A big hole in the back of the tooth, timely to the hospital, after a professional doctor’s examination, choose the best treatment plan.