The first visit to the dentist, the dentist will gives you local anaesthesia and remove all the pulp tissue. He will then put a temporary filling material to fill up the empty spaces. This process is called Access Opening. During the second visit, the temporary filling material is removed and root canal material like gutta percha is placed. A temporary filling material is placed again. This process is called Obturation. During your last visit, the temoporary filling material is removed and replaced by permanent filling material like composite/amalgam and a crown preparation is done.