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Orofacial myofunctional disorders (OMD) (sometimes called “oral myofunctional disorder", and “tongue thrust”) are muscle disorders of the face, mouth, lips, or jaw due to chronic mouth breathing.[1]
Recent[timeframe?] studies on the incidence and prevalence of tongue thrust behaviors are not available. However, according to previous research, 38% of various populations have OMD. The incidence is as high as 81% in children exhibiting speech/articulation problems (Kellum, 1992).