The final goal in every dental therapy is to cure patients and improve their quality of life throughout treatment. Nevertheless, modern dentistry is increasingly facing mistreatments, complications, failures, and even iatrogenic damages. It is therefore deemed valuable for dentists and patients to share protocols, techniques, instruments, materials, and innovations developed to re-treat these clinical cases with no room for error. This atlas contains both in-depth clinical photographs and videos demonstrating novel approaches in the field of oral surgery. Each retreatment case is presented in vivid detail and reproduced step-by-step from patient history to diagnosis/prognosis, treatment planning and treatment to final results and lessons learned.