The first treatment is to seal the root canal with a deactivating agent to kill the pulp by dehydration; the second treatment is to prepare the root canal to remove the necrotic pulp completely and clean the canal thoroughly with a large amount of solution to prepare the root canal in a standard form for the next root canal filling; The third treatment is the root canal filling treatment, in which a test tip is made with a dental cement to see if the cement matches the root canal shape and the extent of the apical area, followed by the filling with a hot cement to completely seal the root canal to avoid bacterial attack afterwards.