The treatment of dental arch stenosis is as follows: 1, treatment of nasal diseases, such as rhinitis, nasal polyps, ear, nose and throat consultation can be requested for active treatment to remove the disease from the internal causes; 2, break bad habits, bad habits mainly refers to open-mouth breathing, can use movable orthodontic appliances to break bad habits; 3, orthodontics for treatment, mainly for arch expansion treatment. There are many ways to expand the arch treatment, you can use movable aligners to expand the arch treatment, movable aligners to expand the arch treatment is mainly for the narrowing of the dental arch. Children with mild severity can use mild or moderate arch expanders to expand the maintenance width. For patients with more severe arch narrowing, a spiral arch expander, also called a rapid arch expander, can be used to expand the alveolar bone. In the case of particularly rare and severe congenital cases where the aforementioned arch expansion is not effective, surgical arch expansion treatment is also performed.