The aim of this course is to make the students are able to diagnose and treat peri-implantitis disease. At the end of the course, the students will be able to diagnose peri-implantitis with proper methods, to classify and treat the disease according to current classifications. They will learn radiological and clinical findings of peri-implantitis, the etiological factors of the disease, and treatment methods for peri-implantitis treatment. They will have a multidisciplinary perspective for the treatment of peri-implantitis by eliminating etiological factors and information about the prognosis of the affected dental implant before and after treatment. The students will be able to make alternative prosthetic and surgical treatment plans in case of loss of dental implant. They will gain theoretical and practical competence on cases.