Treatment of pulpal necrosis can take up to two weeks. The first treatment is done with root canal preparation, removal of necrotic pulpal tissue, enlargement of the root canal, irrigation and sealant, the time needed for this process varies depending on the root or the degree of difficulty, and varies for each case. In the case of anterior teeth, such as a root canal, it is very fast, about ten minutes. For posterior teeth with multiple root canals, such as three root canals or four root canals, it may take about half an hour to 40 minutes. Each doctor’s practice is different and can affect the treatment time. Generally, the patient comes back for a follow-up appointment about a week after the sealant. Depending on the patient, if the last preparation was very good, the next step is to fill. The filling is divided into anterior and posterior teeth, with the anterior teeth requiring less time for root canals and the posterior teeth requiring more time for root canals. After the filling, we need to take a film to see if the filling is in place, and if it is in place, the tooth can be filled. Depending on the situation, inlays can be made directly on the same day, but it takes a long time to make inlays, usually it takes more than an hour to make the inlays after the 3D scan. If a full crown is done, the patient may need to come to the hospital twice, first to bite the model, and then to wear the tooth.