The tooth is rotten with a big hole and it is very smelly, which means that there is caries, firstly, clean up the necrotic tooth tissue in the cavity in time, and then according to the degree of dental caries, choose to fill the restoration, indirect pulp capping, crown restoration after root canal treatment, and so on. 1. Filling and restoration: After the necrotic tissue in the cavity is cleaned up, the nerve is not exposed, and there is only pain caused by hot, cold, sour and sweet stimulation, so direct filling or filling after cushioning is chosen according to the situation. 2. Indirect pulp capping: after the necrotic tooth tissue in the cavity is cleaned up, the caries is close to the pulp cavity, which is more sensitive to cold stimulation, so indirect pulp capping can be adopted to keep the pulp alive. 2. Crown restoration after root canal treatment: after the necrotic tooth tissue in the cavity is cleaned up and the nerve is exposed, it is best to carry out root canal treatment on the tooth in this case, and then choose crown restoration two weeks later to prevent the tooth from splitting. Tooth rotten a big hole and very smelly, it is best to go to the hospital in a timely manner, after a professional doctor’s diagnosis, to determine the best treatment plan, so as not to delay the condition.