Patients who cannot bite on their front teeth will have trouble pronouncing words. For example, the pronunciation of "sa", "shi", "su", "se", and "so" is difficult for patients with an open bite because such pronunciation is made by rubbing upper and lower front teeth together. Orthodontic treatment can correct these speech disorders.

Patients with protruding lower lips and lower jaws do not always speak clearly. As with patients with an open-bite, malocclusion, the front teeth cannot close properly and pronouncing words becomes difficult. Orthodontic treatment for lower lip and lower jaw protrusion is sometimes followed by speech therapy.

Patients with cleft lip or cleft palate disorders tend to have a hole in the upper jaw causing a speech disorder. These patients require bone graft surgery from their hipbone at the age of about ten. Following this treatment they require speech therapy. Further treatment is required if the patient has extra air leaking through the nostrils when he/she speaks. These patients need to be treated with a speech-aid (ancillary equipment) in addition to speech therapy. In some cases a second operation may be necessary.

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