The disorder occurs when the tongue or lip interferes with orofacial structures, functions and development. A common cause of OMDs are tongue and lip ties. This happens with the tissue or frenum under the tongue and upper lip are too short and limits the movement of the tongue and lips. Lip ties can be the cause of a thin and or short upper lip and can cause the lips to be parted at rest creating an open mouth posture. This can contributes to mouth breathing. Additionally, OMDs affects the chewing, swallowing and talking function. If an infant is diagnosed with a tongue tie, it can create problems with breast-feeding as the infant will have trouble with latching. The disorders can also affect the way our face looks, as well as our posture
Obstruction in the upper airway when nasal breathing is disturbed is a common symptom. The body tries too correct itself by breathing through the mouth, which changes the natural growth and position of the jaw, lips, tongue and facial structure.
Upper airway obstruction can put pressure on teeth, by creating a tongue thrust from improper swallowing and tongue position. This forces teeth to move in an inappropriate direction.