title: Re: Retention--retainers may be forever.
authors.forename: R
authors.initials: R
authors.lastname: Berg
mesh_terms: D003724:Dental Arch / Q000033:anatomy & histology; D006801:Humans; D009968:Orthodontic Appliances, Removable; D009971:Orthodontics, Corrective / Q000295:instrumentation / Q000379:methods*