The clinical significance of the width of peri-implant kera- tinized mucosa (KM) remains a subject of ongoing debate but is generally accepted. During the 2017 World Work- shop on the Classification of Periodontal and Peri-Implant Diseases and Conditions, experts failed to identify KM as a contributing factor for peri-implantitis but suggested that “the absence, or a reduced width of KM may negatively affect self-performed oral hygiene measures.”1 However, a recent systematic review has indicated that a reduced width of KM (<2 mm) is associated with an increased biofilm accumulation, soft-tissue inflammation, mucosal recession, marginal bone loss, prevalence of peri-implantitis, and heightened patient discomfort.