The prevalence of peri-implantitis has been reported in the literature to be as high as 29%. The bacteria found in peri-implant lesions are similar to the flora found at the site of periodontitis lesions. Much is known about the surface structure and anatomy of natural teeth, but the diversity of implant designs and surface treatments makes the treatment of peri-implantitis unpredictable and highly variable. There is no international consensus on the treatment of peri-implantitis. Various treatment options are available, such as tetracycline, carbon dioxide laser, and photocatalytic purification. Risk factors: implant sites, especially the maxilla. History of periodontitis. Male patients. Smoking patients. Other factors such as adhesive residue, poor oral hygiene control, restoration design. How to prevent: Early stage often presents as peri-implant mucositis with clinical signs of edema, redness and bleeding on probing of the mucosa. When detected, combined mechanical debridement, local disinfection, and antimicrobial therapy are needed. Treatment: The treatment of peri-implantitis usually involves a surgical approach to remove the inflamed granulation tissue and implant surface treatment, with a personal preference for laser treatment.