After specializing in Orofacial Myofunctional Therapy for almost 40 years, I have found it is NOT the tongue thrust swallow that causes malocclusions but it is the INCORRECT ORAL REST POSTURE OF THE TONGUE AND LIPS that causes dental malocclusions due, primarily, to nasal airway issues. Most patients with dental malocclusions also have lip incompetence so the tongue provides the anterior seal rather than the lips as seen in this 8 year old male patient in the Before photos. The After photos demonstrate the results of Orofacial Myofunctional Therapy (OMT).