Peri–implantitis is described as a destructive inflammatory disease affecting the soft and hard tissues around osseointegrated implants, leading to the formation of a peri–implant pocket and loss of supporting bone. There is various treatment approaches are available for peri–implant disease (conservative & surgical therapy). Peri implant mucositis and moderate case of peri–implantitis can be treated by conservative approach. Treatments include different manual techniques, laser–assisted systems as well as photodynamic therapy, which can be extended by local or systemic antibiotics. It is possible to regain osseointegration. In cases of moderate to severe peri–implantitis cases surgical approach are more effective than conservative therapy. This review aimed to evaluate the etiologies & pathogenesis, risk factors, diagnosis & treatment of peri–implantitis