More and more people choose to replacemissing teeth with dental implants. Thisproduct has given us revolutionarychanges in the dentists' world, wherepatients are given a permanent solutionwithout involving other teeth. Assumptionof course is that you have enough bone toanchor the implant. Many implants have succeeded, but some have failed. Aftersome years of experience with implants,we face a new challenge; peri-implantitis.This is a growing problem around implantswhich, at worse, can result in the loss ofthe implant itself and the bone it sits in.Peri-implantitis is an inflammatory processaffecting the tissues surrounding animplant, leading to loss of supportingtissue. It is caused by bacteria whichorganize themselves in a biofilm, a wordoften associated with dental plaque. Wecan define biofilm as a microbialcommunity, enveloped by self-producedextracellular biopolymers. Biofilms may cause fouling of surfaces, clogging ofpipes, and contribute to many forms ofhuman diseases (Costerton et al., 1999).