[Periodontal disease and its treatment]

A well known development of the chronic periodontal disease is reviewed. However, the histological picture of a gingiva varies at a much lower speed than its clinical picture, and slower than previously described. In presence of periodontitis there may exit a zone of reversible disease of about 2 mm, which give the possibility of obtaining a re-attachment of unknown magnitude. A new connective tissue attachment (on top of the re-attachment) seems only possible if the periodontal ligament cells are allowed to proliferate coronally.