Hey, i asked this last week, i have one down there too, well i was advised that it is because of an electronic current machine they use whilst in surgery affects the metal which then burns your skin and i was told plastic one down there should be fine to keep in, apparantly in the mouth ones need to be removed becuse of a tube they put down your throat and any close to the area of surgery would need to be taken out plastic or metal because or risk of infection xx