Signs and Symptoms of Orofacial Myofunctional Disorders Always breathing through their mouth or having trouble breathing through their nose. Difficulty moving their tongue. Problems with chewing or keeping food in their mouth more than usual. ... An overbite, underbite, and/or other dental problems How Myofunctional Therapy Helps Children Corrects Oral Habits: It targets detrimental habits like thumb sucking or prolonged pacifier use. Improves Breathing: Encourages proper nasal breathing by addr