In the first appointment, after anesthetizing you with a local anesthetic similar to Novocain and application of a rubber dam to isolate your tooth, an opening will be made into the root canal(s). The canal(s) will be cleaned and medicated with antibiotics to get rid of the infection and sealed with a temporary filling material. Except for the use of antibiotics the rest of the procedures done in this appointment are similar to what the investigators do for the patients for need root canal treatment.