Orthodontics deals with the prevention, diagnosis and treatment of malpositioned teeth. Fixed or removable appliances are used as appropriate; aesthetics and function can be restored not only in children and young people, but also in adults. An invisible very comfortable device (invisalign) may be used, consisting of clear aligners that are removed during meals and therefore perfectly hygienic. An additional specialization in the field of orthodontics is emerging for cases defined as Ortho-Perio, that is the study of specific dental movements to solve periodontal problems.