There is some limited evidence suggesting that oral appliance improves subjective sleepiness and sleep disordered breathing compared with a control. Nasal continuous positive airways pressure appears to be more effective in improving sleep disordered breathing than oral appliance. Until there is more definitive evidence on the effectiveness of oral appliances, it would appear to be appropriate to restrict oral appliance therapy to patients with sleep apnoea who are unwilling or unable to comply with continuous positive airways pressure therapy.
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