Eliminate as far as possible, the dentine of the decayed cavity in order to ensure close contact with the pulp. Close contact of the paste with the pulp accelerates the devitalizing process. Insert a pellet of paste into the base of the cavity and seal hermetically with a temporary cement. Devitalization is completed with in five to seven days. After devitalization, a permanent root canal filling can be placed once the pulp is totally removed and pain relief is complete.