There are a variety of issues that can cause upper airway restrictions. One of the most common is the tongue, if it is irregular in position and size it can cause airway restrictions. Other causes can include; • Deviated septum • Tonsils or enlarged adenoids • Chronic allergies • Turbinates Chronic mouth breathing especially can cause dental problems. In extreme cases, the patients can develop an “open bite” and a “v” shape mouth. Posture can also be affected as patients will lean forward with their head and mouth in an attempt to obtain more oxygen while breathing through the mouth.