Mandibular advancement splints are custom-made oral appliances used to treat snoring and selected cases of obstructive sleep apnoea. Worn during sleep, they gently hold the lower jaw forward to help keep the airway open.
At Absolute Sleep, every mandibular advancement splint is made to fit your teeth and bite, then adjusted over time for comfort and treatment response. This guide explains how splints work, who they may suit, how they compare with CPAP and what influences long-term results.
Snoring happens when the soft tissues in your upper airway vibrate as air squeezes through narrowed breathing passages while you sleep. For many people, this narrowing comes down to jaw position, where your tongue sits, and the natural muscle relaxation that happens overnight. One of the most commonly prescribed non-invasive treatments is a mandibular splint for snoring – a device designed to gently reposition your lower jaw and help keep your airway open.
Mandibular splints are part of the custom oral appliance therapy offered by Absolute Sleep, and they’re backed by solid clinical research for both snoring and obstructive sleep apnoea (OSA). In this article, we’ll explain how mandibular splints actually work, what the evidence says about their effectiveness, how they stack up against CPAP therapy, and what factors influence long-term success.
How Mandibular Advancement Splints Work
A mandibular splint, also called a mandibular advancement splint (MAS), is a custom-made oral device you wear while you sleep. It holds your lower jaw slightly forward, which helps prevent your airway from collapsing by creating more space behind your tongue and reducing soft tissue vibration.
When your airway stays more open, airflow becomes smoother and quieter. This can dramatically reduce or even eliminate snoring, and in many cases, improve breathing patterns associated with sleep-disordered breathing.
Unlike the generic mouthguards you can buy over the counter, custom oral appliance therapy is individually designed based on your dental anatomy, jaw movement, and airway structure. Professional fitting and ongoing adjustments are essential for comfort, effectiveness and making sure you’ll actually use it long-term.
Who May Benefit From a Mandibular Advancement Splint?
Mandibular advancement splints can be suitable for people with primary snoring and for selected people with obstructive sleep apnoea. Suitability depends on your symptoms, dental health, jaw movement, medical history and, where needed, the results of a sleep study.
The STOP-BANG questionnaire helps identify risk factors for obstructive sleep apnoea, including loud snoring, daytime tiredness, observed breathing pauses and high blood pressure. It is a screening tool, not a diagnosis, but it can help determine whether further sleep testing should come before treatment.
A higher STOP-Bang score suggests you’re more likely to have sleep-disordered breathing and may need further evaluation. While it’s not a diagnostic test on its own, it helps clinicians work out whether treatments like mandibular splints might be right for you, or whether you need more detailed sleep testing.
For independent, evidence-based information on snoring and sleep apnoea, the Sleep Health Foundation is a great resource.
Are Mandibular Advancement Splints Effective?
For appropriately selected patients, mandibular advancement splints can reduce snoring and improve sleep-related breathing. Results vary depending on the severity and pattern of sleep apnoea, the fit and adjustment of the appliance, and how consistently it is worn.
What Clinical Studies Show
Research looking at mandibular advancement devices across different patient groups has found:
- Significant drops in the Apnoea-Hypopnoea Index (AHI)
- Reduced snoring frequency and intensity
- Improvements in subjective daytime sleepiness
- Better quality-of-life scores
The strongest outcomes are typically seen in patients with mild to moderate obstructive sleep apnoea, as well as those whose main issue is snoring without severe airway collapse.
Long-term studies also show sustained symptom improvement when devices are properly adjusted and reviewed over time. A major Cochrane Review on oral appliances for sleep apnoea supports their use as an effective alternative for appropriately selected patients.
Another study that evaluated the effectiveness of mandibular advancement devices in treating very severe obstructive sleep apnea found that many patients experienced significant symptom improvement, with research reporting meaningful AHI reductions and real relief from snoring and tiredness.
Mandibular Advancement Splints vs CPAP
CPAP is a common treatment for moderate to severe obstructive sleep apnoea and can be highly effective when it is used consistently. Some people, however, find the mask, airflow pressure or equipment difficult to tolerate over time.
For suitable candidates, a mandibular advancement splint offers a smaller, custom-fitted alternative. It is worn inside the mouth and does not require a mask, machine or tubing.
A splint may not reduce breathing events to the same extent as CPAP in every case. However, comfort and regular use matter, which is why assessment, fitting and follow-up adjustments are an important part of treatment.
You can find more information on treatment pathways on the Absolute Sleep sleep apnoea treatment page.
What Does a Mandibular Advancement Splint Cost?
The cost of a mandibular advancement splint varies because treatment is tailored to the person, the appliance and the care required. It usually includes a clinical assessment, custom fabrication from dental impressions, professional fitting and follow-up appointments to refine comfort and jaw position.
A consultation is the best way to understand the expected cost for your treatment and whether a splint is appropriate for you. It also gives you the chance to discuss treatment stages, ongoing reviews and any relevant health-fund considerations before proceeding.
This personalised approach helps avoid problems like jaw discomfort, bite changes, or poor compliance that can happen with off-the-shelf devices. Cost discussions usually take place during your consultation, which you can arrange via the Absolute Sleep Contact Page.
What Affects Mandibular Advancement Splint Success?
Individual Airway Anatomy
No two airways, bites or sleep patterns are the same. Treatment success depends on a combination of your anatomy, diagnosis, appliance fit and ongoing adjustment.
Your jaw position, tongue size, dental alignment, and nasal airflow all play a role in how well your airway stays open during sleep. Patients with mild to moderate airway collapse tend to respond more predictably.
Severity and Pattern of Symptoms
People who experience regular snoring, persistent daytime tiredness, or witness breathing pauses often see clearer improvements when the device is carefully adjusted over time.
Compliance and Ongoing Review
Wearing your splint consistently every night is essential. Regular follow-up appointments allow your clinician to fine-tune the splint position and monitor your progress.
When Mandibular Advancement Splints May Not Be Suitable
Mandibular advancement splints are not right for everyone. Severe obstructive sleep apnoea, untreated dental problems or certain jaw-joint conditions may require a different treatment or a combined approach.
A proper assessment helps identify the safest and most appropriate option for your symptoms, dental health and diagnosed sleep condition.
Start Sleeping Better – Book a Mandibular Advancement Splint Assessment
Loud snoring, unrefreshing sleep and daytime tiredness can have different causes. An assessment can help determine whether a mandibular advancement splint is appropriate for you, or whether
Book your consultation with Absolute Sleep to discuss your treatment options.
FAQs on Mandibular Splints for Snoring
How soon will snoring improve with a mandibular splint?
Many people notice reduced snoring within a few weeks. The best results usually come after proper fitting and gradual adjustment under clinical supervision.
Does a mandibular splint treat sleep apnoea symptoms?
Research shows mandibular splints can significantly reduce snoring and daytime tiredness, particularly in people with mild to moderate obstructive sleep apnoea.
What is the difference between a custom splint and an over-the-counter device?
Custom devices are designed specifically for your bite, jaw movement, and airway anatomy, which makes them more effective and comfortable than generic mouthguards.
How long does a mandibular splint last?
With proper care and regular reviews, many splints last several years. How long yours lasts will depend on the materials, how often you use it, and how well you maintain it.
Is a mandibular splint suitable for everyone who snores?
Not always. You’ll need a clinical assessment to work out whether your snoring is an isolated issue or linked to more complex sleep-disordered breathing.
