An implant develops bleeding and bone loss like periodontitis. What is the lesson? Peri-implantitis mirrors gum disease - plaque triggers it, smoking and past periodontitis raise risk, and it progresses faster because implants lack a PDL's defence. Management: professional debridement with implant-safe instruments, risk-factor control, sometimes surgery. Students learn implants are not fit-and-forget: they need the same lifelong maintenance as teeth, in patients selected and motivated for it.