The filling usually takes about half an hour to two weeks, the length of time depends on the specific situation of the tooth. If the cavity of the crown is shallow, located in the enamel and dentin layer, and there is no sensitivity to hot, cold, sour or sweet stimuli, the filling can be completed within half an hour after grinding away the decayed tooth tissue. If the pulp of the tooth is exposed and causes severe pain, it is necessary to remove the pulp and carry out root canal preparation under local anesthesia, and root canal filling can be carried out only after a week of root canal disinfection, if the tooth has no obvious knocking pain and exudate. Chronic pulpitis that is recurrently infected and does not heal easily will take about two weeks to treat. If the patient has chronic periapical inflammation, fistulas and sinus tracts will also need to be removed to complete treatment.