title: The myth of Janus: Orthodontic progress faces orthodontic history.
authors.forename: Marc B
authors.initials: MB
authors.lastname: Ackerman
mesh_terms: D049673:History, 20th Century; D049674:History, 21st Century; D006801:Humans; D008310:Malocclusion / Q000266:history / Q000628:therapy; D009970:Orthodontics / Q000266:history* / Q000639:trends; D009971:Orthodontics, Corrective / Q000266:history; D014481:United States