1. Simple: patients can take on and off by themselves 2. Orthodontics can be used as a late addition to maintain used for some tooth problems. 3. Orthodontic Trainer Dental Tooth Appliance Alignment Brace Mouthpieces Tools Product . Size:5.7cm*4.1cm 4. Applicable to young children in upper and lower teeth are crowded,open jaw,jaw deep overbite,maxillary protrusion,the usual broad lips. 5. Simple, practical, effective treatment of a new type of orthodontic equipment, the idea dental arch track ,moderate force.