Orofacial Myofunctional Disorders (OMDs) are disorders of the muscles and functions of the face and mouth. OMDs may affect, directly and/or indirectly, sleep apnea, facial skeletal growth and development, breathing, chewing, swallowing, speech, occlusion, posture, temporomandibular joint movement, oral hygiene, stability of orthodontic treatment, facial esthetics, restricted facial and lingual frenum, forward head posture, incorrect oral habits and more.