Sleep Apnoea and Orthodontics UK

What is obstructive sleep apnoea?

Obstructive sleep apnoea is a sleep disorder in which the soft tissues at the back of the throat — including the tongue, soft palate, and pharyngeal walls — relax during sleep and block the airway, causing breathing to pause repeatedly throughout the night. These pauses, called apnoeas, can last from a few seconds to over a minute and may occur dozens or hundreds of times per night. Each apnoea ends with a partial arousal as the brain responds to the oxygen drop, fragmenting sleep architecture even if the person does not wake fully. Common symptoms include loud snoring, witnessed breathing pauses, excessive daytime sleepiness, morning headaches, poor concentration, and irritability. OSA is significantly underdiagnosed in the UK; it is estimated that around 1.5 million adults have OSA, with the majority undiagnosed. Risk factors include excess weight, male sex, increasing age, neck circumference, alcohol use, and specific anatomical features including retrognathia (a receding lower jaw), a narrow upper arch, enlarged tonsils or adenoids, and a low-lying soft palate. Anatomical factors are particularly relevant to orthodontic and maxillofacial management.

How orthodontic treatment can help with OSA

Orthodontic and dental sleep medicine interventions target the anatomical contributors to airway obstruction. The primary approaches include mandibular advancement devices (MADs), maxillomandibular advancement surgery (MMA), and in some cases upper jaw expansion. These are appropriate for different severity levels and patient profiles. Mandibular advancement devices are the most widely used orthodontic intervention. They work by holding the lower jaw (mandible) in a forward position during sleep, which tenses the pharyngeal walls and tongue and reduces their tendency to collapse. The device is worn at night and is removable. MADs are the recommended first-line treatment for mild-to-moderate OSA in UK guidelines (NICE and British Thoracic Society) and are an alternative for patients who cannot tolerate CPAP. Maxillomandibular advancement surgery moves both jaws forward surgically, directly increasing the pharyngeal airway space. It is the most effective surgical treatment for OSA with a skeletal component. Invisalign's Mandibular Advancement feature, available in certain aligner systems, allows gradual mandibular repositioning simultaneously with tooth alignment and may be suitable for mild OSA in appropriate cases.

Mandibular advancement devices: how they work and what to expect

A mandibular advancement device is a custom-made appliance that fits over the upper and lower teeth and holds the lower jaw in a protruded position throughout sleep. Unlike over-the-counter snoring devices, a clinically prescribed MAD is custom-fabricated from impressions or digital scans and is titrated (gradually advanced) to find the optimal therapeutic position — typically around 50 to 75% of maximum mandibular protrusion. Titration is important: advancing the jaw too little provides inadequate treatment, while advancing too far increases side effects. Side effects of MAD use are common, particularly during the early weeks. Tooth tenderness, jaw ache, and increased salivation are typical and usually resolve. A more significant long-term concern is orthodontic change: studies consistently show that long-term MAD use (five years or more) causes small but measurable changes in tooth position and occlusion, including a reduction in overbite, retroclination of upper incisors, and proclination of lower incisors. These changes are generally subtle and clinically acceptable in the context of treating a significant health condition, but patients should be aware of them. Morning jaw exercises and an occlusal repositioning device used briefly after waking can help manage the occlusal discomfort that often occurs in the first minutes after removing the MAD. A dentist or orthodontist experienced in dental sleep medicine should monitor occlusal changes annually. MAD therapy is not suitable for patients with insufficient teeth to support the appliance, severe TMJ disorder, or central sleep apnoea.

CPAP versus MAD for mild-to-moderate OSA

Continuous positive airway pressure (CPAP) is the gold-standard treatment for moderate-to-severe OSA. A CPAP machine delivers pressurised air through a mask worn during sleep, physically keeping the airway open. CPAP is highly effective when used correctly, but adherence is a significant problem — surveys consistently show that 30 to 50% of patients either abandon CPAP or use it for fewer than four hours per night, below the threshold for adequate treatment. For patients with mild-to-moderate OSA, UK guidelines recommend MAD as a clinically appropriate alternative to CPAP, particularly where CPAP intolerance is likely or where the patient prefers a non-machine treatment. Evidence from randomised controlled trials shows that while CPAP produces slightly greater reductions in apnoea-hypopnoea index (AHI) on average, real-world outcomes are similar because MAD is used for longer each night. For patients who have tried and cannot tolerate CPAP, a MAD trial is strongly recommended. For patients with severe OSA who cannot tolerate CPAP, referral for surgical assessment may be appropriate. The decision between CPAP and MAD should involve a sleep physician; dentists and orthodontists providing MAD therapy work within a multidisciplinary team alongside sleep medicine services.

Jaw surgery for sleep apnoea

Maxillomandibular advancement (MMA) surgery, which moves both the upper and lower jaws forward by 8 to 12 mm, significantly enlarges the pharyngeal airspace and the velopharyngeal, oropharyngeal, and hypopharyngeal dimensions simultaneously. It is the most effective surgical treatment for OSA with a skeletal component and achieves surgical success (defined as a 50% or greater reduction in AHI with AHI below 20) in approximately 85 to 90% of appropriately selected patients. MMA is appropriate for patients with moderate-to-severe OSA who have a skeletal contribution to their airway obstruction and who have failed or cannot tolerate CPAP. It is also appropriate for patients with severe retrognathia or upper airway narrowing regardless of CPAP response, where the anatomical problem is unlikely to be managed non-surgically long-term. The procedure involves orthodontic preparation to align teeth within each jaw, the surgical advancement, and post-surgical orthodontic finishing — a process that typically takes two to three years in total. Recovery after MMA surgery involves a period of jaw immobilisation or elastic fixation, a liquid and soft diet, and significant swelling that resolves over several months. Most patients return to work within two to four weeks, though full recovery takes longer. NHS funding for MMA for OSA depends on clinical criteria and specialist multidisciplinary team approval; private MMA surgery typically costs £15,000 to £30,000 in the UK. Other surgical options include uvulopalatopharyngoplasty (UPPP), tongue base procedures, and hypoglossal nerve stimulation, but these are generally less effective than MMA for patients with a skeletal component.

Orthodontic effects of MAD: long-term considerations

Long-term mandibular advancement device use is associated with measurable but generally modest changes in dental occlusion. The most consistently reported finding is a reduction in overjet and overbite over time, caused by retroclination of upper incisors and proclination of lower incisors from the persistent forward jaw posture. Posterior open bite can also develop in some patients, particularly with prolonged use at high advancement levels. These changes are typically in the range of 1 to 2 mm over five years and are clinically relevant to monitor but rarely require orthodontic intervention. In some patients with a pre-existing deep overbite, modest reduction may actually improve the occlusion. The key principle is that a clinical dentist experienced in dental sleep medicine should examine the occlusion annually and document changes. If significant occlusal shift occurs, a review of the MAD design, advancement level, or morning repositioner use may be warranted. Patients undergoing concurrent orthodontic treatment should inform their orthodontist about MAD use, as the forces from the device may interact with planned tooth movements.

NHS referral pathway and accessing treatment in the UK

The recommended pathway for suspected OSA in the UK begins with the GP. A patient presenting with snoring, witnessed apnoeas, and excessive daytime sleepiness should be referred to a sleep clinic for diagnostic polysomnography or a home sleep study. Following diagnosis, the sleep clinic will recommend treatment, which may include CPAP, MAD, weight management advice, positional therapy, or surgical referral depending on severity and patient profile. MAD provision may be via the NHS sleep service or via NHS dental referral, depending on local commissioning arrangements. Dental sleep medicine services are not uniformly available across the UK, and some patients will need to access MAD privately. Private MAD provision is widely available from dentists trained in dental sleep medicine; costs for a custom-titrated MAD typically range from £500 to £1,500. Surgical referral for MMA is via the sleep clinic to oral and maxillofacial surgery; NHS funding requires evidence of CPAP failure and appropriate clinical criteria.

Useful related pages

This guide is for general information only. It is not a diagnosis, treatment plan, or substitute for advice from a registered dentist or orthodontist.