The length of time it takes to fill a tooth is related to the degree of tooth defect, if the tooth defect is only in the enamel layer and dentin layer, the filling can be completed at one time, which takes about half an hour; if it has spread to the nerve of the tooth, it needs to be treated with root canal therapy, and the whole process takes about 2 weeks. Filling generally refers to the tooth body has a defect, need to fill the process of treatment. If the scope of defective teeth only to the enamel layer or dentin layer, it can be directly de-rotted, sterilized, and then filled directly with the appropriate material, usually takes about half an hour to complete the treatment. If the dentin defect has spread to the nerve of the tooth, and root canal treatment is needed, it is necessary to make several follow-up visits, usually through the steps of opening the pulp, extracting the pulp, preparing the root canal, sterilizing the root canal, and filling the root canal, and it takes about 2 weeks to complete a root canal treatment process. If there is a missing tooth and a filling is needed, the patient should visit the clinic in time, complete the examination, and carry out the appropriate filling treatment under the guidance of a professional physician.