It depends on the severity of the peri-implant infection. If the infection has spread to the bone and weakened the dental implant it may be necessary for your dentist to replace the old dental implant with a new one. It is likely that you’ll be recommended a course of antibiotic medication to remove the infection before surgery.
If your dentist spots the peri-implantitis disease before its infection has spread too much, then a course of antibiotic treatment and thorough oral hygiene regimen may be enough to resolve the peri-implant disease.