Endodontics Removal of broken tools Endodontic surgery Closure of perforation Removal of a sealer and gutta-percha from the bone Closure of odontogenic fistula Implantology Protetics Aesthetics dentistry Radiology         The patient was referred to me for root canal treatment of upper left sixth tooth with active fistula.           RVG picture – untreated mesial canals.           View of tooth’s chamber before repeated root canal treatment.           The RVG picture taken after treatment of 4 root canals.           An intraoral picture taken 7 days after beginning of the treatment. The fistula spontaneously backed up after proper root canal treatment.