Endodontic treatment is a sequence of treatment for the pulp of a tooth to eliminate the bacterial infection from dental caries, or an extremely worn dentition to the pulp , which is the cause of tooth ache. If the infection is spread to the apex , it can develop to an apical cyst. The other causes of the infection in the pulp are accident to the tooth , or extremely biting force to the tooth or periodontal disease involve the apex of the tooth. Bacterial infection may come from the apex. The treatment will be removed the pulp using medication until there is no sign and symptom and the bacterial infection is eliminated, root canal filling material and a suitable restoration will be made.