Usually, depending on the condition of the pulp and the degree of pulp removal, different treatment methods are needed. If the pulp is completely removed during the treatment and the vitality test is normal, the permanent filling of the cushion can be performed at once. If the carious tissue can be removed clinically, but the patient suspects that the tooth has been painful, and the pulpitis cannot be identified, then the tooth should be treated first with pacification treatment, and then the tooth should be treated according to the later situation. This process is usually observed for two weeks, if the affected tooth feels normal and no pain occurs after two weeks, the one-time filling treatment can be completed. If the tooth is painful or the symptom is more obvious, then root canal treatment is considered. In addition, if the carious tissue cannot be removed and the tooth is close to the nerve, but the pulp vitality test shows normal, then indirect pulp capping can be performed with calcium hydroxide, and the restorative dentin will be formed after 3-6 months, and then the carious tissue can be removed and then the filling treatment can be performed. Deep caries refers to the caries progressing to the deep layer of dentin, such as cavity, which can be easily detected by clinical examination. The treatment of deep caries is mainly to remove the carious tissue, and pay attention to protect the pulp during the treatment to prevent the mechanical and temperature stimulation to the pulp. In addition, the correct judgment of pulp state is the key to the success of deep caries treatment.