As dental implants have become a popular treatment modality for edentulous sites, there is a need for a peri-implant maintenance protocol. This article reviews the anatomy of peri-implant tissues, examines the etiology and risk factors of peri-implant diseases, and outlines nonsurgical and surgical treatment of these diseases. The clinical and radiographic steps necessary to diagnose peri-implant diseases during the phase of peri-implant maintenance, along with available treatment protocols to maintain or recover peri-implant health will be discussed.