Mandibular Advancement Device UK

How mandibular advancement devices work

A MAD works by holding the lower jaw (mandible) in a protruded position during sleep. This prevents the soft tissues at the back of the throat — the tongue, soft palate, and uvula — from collapsing inward and partially or fully blocking the airway. By keeping the lower jaw forward, the airway diameter is maintained, reducing the vibration that causes snoring and preventing the apnoeic events where breathing briefly stops. Most MADs have an upper and lower tray connected by a titration mechanism that allows the degree of advancement to be gradually increased until the optimal therapeutic position is found. This titration process usually takes several weeks of nightly adjustment under clinical guidance. The device is worn only during sleep and removed in the morning.

NHS provision and private options

NHS provision of MADs is primarily through sleep clinics following a formal diagnosis of obstructive sleep apnoea (OSA). A GP referral to a sleep clinic is typically required, where overnight pulse oximetry or polysomnography (sleep study) is used to confirm diagnosis and severity. For mild to moderate OSA, a MAD may be prescribed through the NHS. However, NHS pathways vary significantly by region, waiting lists can be lengthy, and access is not universal — some trusts prioritise CPAP over MAD even where MAD would be appropriate. In the private sector, MADs are available from dentists and orthodontists with sleep medicine training. Private MADs cost between approximately £400 and £1,500 depending on the device type, the practice, and the number of review appointments included. A private consultation with a sleep physician or specialist dentist can run from £150 to £350 before appliance fees.

Custom-fitted vs boil-and-bite devices

Over-the-counter boil-and-bite MADs are available from pharmacies and online retailers costing between £20 and £100. While better than nothing for simple snoring, boil-and-bite devices are not recommended for diagnosed obstructive sleep apnoea. They lack the precision titration needed to reach a reliable therapeutic advancement level, do not fit as accurately, and are less durable. Custom-fitted MADs are fabricated by a dental technician from impressions or digital scans of the patient's teeth. The fit is precise, the titration mechanism is reliable, and they are far more comfortable to wear, which dramatically improves compliance. For OSA treatment specifically, only custom-fitted devices manufactured by a regulated dental professional should be used. Devices such as Somnowell, SomnoMed MAS, and the Narval CC are among the most widely used custom MADs in UK practice.

Orthodontic side effects with long-term use

Because a MAD holds the lower jaw in a protruded position for seven or more hours every night, it applies sustained force to the teeth and surrounding structures. Over months and years this can produce measurable orthodontic effects. The most commonly reported changes include a reduction in overjet (the horizontal gap between upper and lower front teeth), a reduction in overbite (the vertical overlap), and forward movement of the lower incisors. In some patients the upper incisors may retrocline slightly. These changes are usually gradual and may not be clinically significant for several years, but studies have shown that patients using MADs for five years or more often show detectable bite changes. In some cases patients notice their back teeth no longer meet properly in the morning — this transient morning occlusal change is common and usually self-corrects within an hour. However, permanent bite changes can occur and may be functionally or aesthetically significant. TMJ symptoms are occasionally reported, particularly in patients with pre-existing TMD, though most patients do not experience joint problems when a device is properly fitted and titrated.

Need for orthodontic monitoring

Any patient wearing a MAD long-term should be reviewed regularly by a dentist or orthodontist. Reviews should include assessment of occlusal changes, incisor position, and patient-reported bite symptoms. At minimum, annual review is recommended; many sleep medicine dentists review MAD patients every six months. If significant bite changes are detected, the clinician and sleep physician will need to discuss whether to continue, modify, or replace the device, and in some cases whether orthodontic treatment is warranted to correct tooth movement that has accumulated. Patients should not purchase MADs online or through non-dental providers without clinical oversight, precisely because these side effects can go undetected without professional review.

Maintenance and lifespan

Custom MADs typically last between two and five years with normal use, though this varies by device type and patient habits. Nightly wear, teeth grinding (bruxism), and accidental damage all reduce lifespan. Devices should be cleaned daily with a soft brush and mild soap or denture cleaner — toothpaste is abrasive and should be avoided. Storage in a dry, ventilated case is recommended. Most manufacturers offer replacement parts or can reline devices to extend their working life. NHS replacement policies vary; privately, replacement devices are typically charged at or near the original cost. Patients should notify their dentist promptly if the device no longer fits snugly, as gaps in the fit reduce therapeutic effectiveness and accelerate tooth movement from uneven force distribution.

MAD versus CPAP

Continuous positive airway pressure (CPAP) therapy is generally accepted as the gold standard treatment for moderate to severe obstructive sleep apnoea. CPAP delivers a continuous stream of pressurised air through a mask worn during sleep, physically preventing airway collapse. It is more consistently effective than a MAD across all OSA severity levels. However, CPAP has a well-documented compliance problem: many patients find the mask uncomfortable, claustrophobic, or disruptive to bed partners, and long-term adherence rates are often below 50%. MADs tend to be better tolerated — they are smaller, quieter, and easier to travel with — but they are less effective for severe OSA. For mild OSA, either treatment can be appropriate. For moderate OSA, MAD is a legitimate alternative to CPAP in patients who cannot tolerate or refuse CPAP. For severe OSA, CPAP is strongly preferred and MAD is usually considered an adjunct or second-line option only if CPAP fails. Patients with positional OSA (symptoms mainly when sleeping on the back) may benefit significantly from positional therapy either alongside or instead of a device.

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.