The area to be treated is anesthetized by local anaesthesia so that no pain is felt in the root treatment. The treatment of root is carried out by cleaning the inflamed tissues in the teeth and injecting certain drugs into the root canal. This process can be made with 3-4 sessions. Time of the drugs which placed in the root of the teeth are limited. If these drugs remain longer than they should be, they will leak from the root and cause great damages and problems in the jaw bone. For this reason, it is very important to stay in touch with the dentist during the root treatment.