Obstructive sleep apnoea (OSA) is characterized by repeated episodes of upper airway occlusion during sleep. Signs and symptoms include excessive daytime sleepiness, morning headaches, loss of concentration associated with sleep deprivation. Snoring is the most common presenting complaint with OSA. In Asia, the prevalence of symptomatic OSA in middle aged men and women is 4.1-7.5% and 2.1-3.2% respectively.

Sleep problems are common in children. Snoring occurs in more than 25% of Singapore children and OSA occurs in 1-3% of children, Children with OSA may display behavior problems or school difficulties as they have problems paying attention in class.

Excessive relaxation of upper airway muscles causes airway collapse and obstruction during sleep. While the most effective treatment is provided by positive-pressure breathing machines, they are not well tolerated by most patients. Oral appliances are small, portable and lightweight which is generally more comfortable. Oral appliances that enhance airway patency are often more effective with mild to moderate obstructive sleep apnea problems. The mandibular advancement device (MAD) consists of upper and lower splints attached to the teeth and postures the lower jaw forward.