Perforation of a root canal during endodontic therapy can also lead to a periodontal abscess. Thereupon, dental restorations and endodontic therapy became again favored. Require endodontic (root canal) treatment or tooth extraction. In the deciduous maxillary central incisor, endodontic treatment is less frequent. This is typically the case in amalgam restorations and endodontic treatment. It is also the result of inadequate debridement during the endodontic procedure. Although general dentists can perform endodontic treatment, there are several things which set endodontists apart. It is used mainly in endodontic, fixed prosthodontic (crowns, bridges) and general restorative treatments. For the permanent tooth, endodontic treatment can be considered. In certain cases, endodontic therapy may be necessary for the restoration of a tooth. The secondary therapeutic goal of regenerative endodontic procedures is continued root development. The worst pain of endodontic therapy was reported with the initial anesthetic injection. In endodontic therapy, removal of the inflamed pulp relieves the pain. Two main flap designs used in endodontic surgery are full and limited mucoperiosteal flaps. In endodontic procedures, corrosive irrigants are contained such as sodium hypochlorite (bleach).