Renvert S, et al. - The prevalence and development of peri-implant mucositis and peri-implantitis were determined. Moreover, the authors evaluated the risk factors over time. In this follow-up study, the prevalence and development of peri-implantitis and peri-implant mucositis were high. As per the findings, healthy conditions at implants after 9-14 years were predictive of future implant health.