What is a mandibular advancement device?
A MAD is an oral appliance worn at night. It covers the upper and lower teeth and holds the lower jaw (mandible) a few millimetres forward, which also pulls the tongue forward and tightens the soft tissue at the back of the throat. This enlarges the airway and reduces vibration (snoring) and collapse (apnoea). Many designs allow gradual adjustment of the jaw position.
See snoring remedies for other options.
Who is it for?
- People with primary snoring (snoring without apnoea).
- People with mild to moderate obstructive sleep apnoea, especially if they cannot tolerate CPAP.
- People with severe apnoea who cannot use CPAP, as an alternative, with specialist follow-up.
- It requires enough healthy teeth to anchor the device and a healthy jaw joint.
- It is generally not suitable for people with severe jaw joint disorders, loose teeth, advanced gum disease or dentures that cannot support the device, or with central sleep apnoea.
How well does it work?
Systematic reviews show that custom MADs reduce snoring in most people and lower the apnoea–hypopnoea index in many with mild to moderate sleep apnoea, improving sleepiness and quality of life. CPAP lowers the apnoea index more, but MADs are often worn more consistently, so the real-world outcome is sometimes similar. Professional guidelines recommend oral appliance therapy for adults with snoring who do not have sleep apnoea, and as a second-line option for those with apnoea who decline or cannot tolerate CPAP.
Types: custom or over-the-counter
- Custom-made MAD: made from impressions or scans by a dentist, titratable, more comfortable and more effective; recommended for sleep apnoea.
- Boil-and-bite devices: softened in hot water and moulded to the teeth at home; cheaper but fit and durability vary, and the jaw position is harder to adjust.
- Tongue-retaining devices: hold the tongue forward with suction; an option for people without enough teeth.
- Check the product is cleared by a recognised regulator and ask your dentist or sleep specialist for advice.
The fitting process
- Medical assessment and, ideally, a sleep study to establish whether you have apnoea and how severe it is.
- Dental examination to check teeth, gums and jaw joints; X-rays if needed.
- Impressions or digital scans and fabrication of the device.
- Fitting and gradual adjustment over weeks until snoring and apnoea improve without excessive discomfort.
- Follow-up sleep study to confirm the effect, and regular dental review every 6–12 months.
Side effects
- Jaw, tooth or facial discomfort, especially at first.
- Excess saliva or dry mouth.
- Tooth movement and changes in the bite with long-term use; periodic review is needed.
- Jaw joint (TMJ) pain or clicking in some people.
- Gum irritation or loosening of dental work.
- Most side effects are mild and improve with adjustment; stop and consult your dentist if there is persistent pain.
Caring for your device
Brush the device after each use with a soft toothbrush and mild soap or a non-abrasive cleaner, rinse in cool water and store it dry in its case. Do not use hot water, which can warp it. Replace it as advised: many last 2–5 years. Bring it to dental check-ups and report any changes in your bite.
When to see a doctor first
- Snoring with pauses in breathing, gasping or choking.
- Daytime sleepiness, morning headaches or poor concentration.
- High blood pressure, heart rhythm problems or obesity.
- Nasal blockage that may need treatment alongside the device. See blocked nose at night.
- Jaw pain, loose teeth or gum disease before fitting a device.
Three common situations
Loud snoring without apnoea: a custom MAD can help the whole household sleep better.
Mild sleep apnoea and CPAP intolerance: a custom MAD is a reasonable alternative with follow-up testing.
Over-the-counter guard causing jaw pain: stop, and seek a custom fitting and assessment.
Practical tips: travelling, dry mouth and adjustments
Carry the device in its case when you travel and never wrap it in tissue, where it is easily thrown away. If you wake with excess saliva or dry mouth, try sipping water before bed and discuss with your dentist whether a slight adjustment would help. If your teeth feel different in the morning, a short bite-reset exercise (gentle jaw movements and chewing sugar-free gum) is often recommended; tell your dentist if the sensation persists. Keep your sleep study and dental appointments to make sure the device keeps working as your bite changes.
Key points to remember
Custom mandibular advancement devices are an effective option for snoring and mild to moderate apnoea. Get a sleep assessment first, choose a trained dentist, expect an adjustment period and keep up with follow-up. Our ENT team can evaluate your airway and coordinate treatment.
This guide is for general information and does not replace an assessment by your own doctor or ENT specialist.
Questions about mouth guards for snoring
These answers are general information and do not replace an examination or individual medical advice.
Do mouth guards for snoring work?
Custom mandibular advancement devices reduce snoring in most people; over-the-counter products vary.
Can a mouth guard treat sleep apnoea?
Custom devices can treat mild to moderate apnoea and some severe cases when CPAP is not tolerated, with follow-up.
Is a boil-and-bite guard good enough?
It may help snoring in some people, but fit and adjustment are limited; custom devices perform better.
How long does it take to get used to it?
Usually 1–4 weeks of adjustment.
Can it damage my teeth?
It can cause tooth movement over time, so regular dental review is important.
Is it better than CPAP?
CPAP is more effective for moderate to severe apnoea, but a mouth guard may be easier to tolerate.
Can I wear a mouth guard if I have dentures?
Usually not a standard MAD, since it needs healthy teeth to anchor; tongue-retaining devices or other options may be considered.
Sources
This guide is for general information and does not replace medical advice. How a problem is diagnosed and treated depends on your examination and medical history. If you think you have an emergency, contact your local emergency services.