Book excerpt: Endodontic retreatment is technically more difficult to perform, involves greater risks, and is more unpredictable clinically compared with primary endodontic treatment. This book addresses topics such as indications for endodontic retreatment; safe and efficient removal of existing restorations and obturation material; challenges such as fractured instruments, hard pastes, blockages, and negotiation of the canal; treatment of perforations; management of a tooth with a wide-open apex; and assessment of prognosis and success. Well-illustrated with clinical photographs, radiographs, and diagrams, the book will enable practitioners to undertake endodontic retreatment with greater confidence.