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A '''mandibular splint''' or '''mandibular advancement splint (MAS)''' is a device worn in the mouth that is used to treat obstructive sleep apnea (OSA) and snoring. These devices are also known as "mandibular advancement devices," "sleep apnea oral appliances," and "sleep apnea mouth guards."
The splint treats snoring and sleep apnea by moving the lower jaw forward slightly, which tightens the soft tissue and muscles of the upper airway to prevent obstruction of the airway during sleep. The tightening created by the device also prevents the tissues of the upper airway from vibrating as air passes over them – the most common cause of loud snoring.
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