In the beginning, osseointegration was thought to be sufficient for long-term successful implant rehabilitation. With time, it became clear that soft-tissue integration is of paramount importance for long-term success. Recent studies suggest that the absence or a reduced width of KM may negatively affect self-performed oral hygiene measures, and that poor plaque control constitutes a risk factor for peri-implantitis. As a result, in cases of peri-implant biological complications, the treatment should also be focused on the creation of an effective soft-tissue barrier capable of biologically protecting the peri-implant structures.