Dental Services

Mandibular Advancement Devices: What They Are and What to Expect

What Is a Mandibular Advancement Device?

A mandibular advancement device — commonly referred to as a MAD, and sometimes called a mandibular advancement splint or oral appliance — is a custom-fitted dental device worn during sleep that gently holds the lower jaw in a slightly forward position. This small but precise repositioning of the jaw opens the airway at the back of the throat, reducing or eliminating the obstruction and vibration that cause snoring and sleep apnea.

Mandibular advancement devices are worn in the mouth during sleep — similar in appearance to a sports mouthguard or orthodontic retainer — and are removed upon waking. They are discreet, portable, and silent, making them a highly practical alternative to other forms of sleep apnea treatment for many patients.

Oral appliance therapy for sleep-disordered breathing is a recognized and well-researched field of dental practice. Dentists who provide this treatment — sometimes called dental sleep medicine practitioners — work closely with sleep physicians to ensure patients receive a comprehensive and medically appropriate approach to their care.

What Do Mandibular Advancement Devices Treat?

Mandibular advancement devices are primarily used to treat two closely related conditions: snoring and obstructive sleep apnea.

Snoring
Snoring occurs when the soft tissues at the back of the throat — including the soft palate, uvula, and tongue — relax during sleep and partially obstruct the airway. As air is forced through the narrowed passage, these tissues vibrate, producing the characteristic sound of snoring. While snoring is not always a sign of a serious medical condition, it can be disruptive to both the snorer and their sleep partner, and it is frequently associated with obstructive sleep apnea.

By gently advancing the lower jaw, a mandibular advancement device tightens and stabilizes the soft tissues of the throat, reducing the vibration that causes snoring. Many patients experience a dramatic reduction or complete elimination of snoring with oral appliance therapy.

Obstructive Sleep Apnea
Obstructive sleep apnea — commonly abbreviated as OSA — is a serious and highly prevalent sleep disorder in which the airway repeatedly collapses or becomes completely blocked during sleep, causing the patient to stop breathing for periods of ten seconds or longer. These breathing pauses — called apneas — can occur dozens or even hundreds of times per night, causing the brain and body to be repeatedly jolted from deep sleep to a lighter state in order to reopen the airway and restore breathing.

Most patients with OSA are entirely unaware that these events are occurring. Common signs and symptoms include:

Loud, chronic snoring — often interrupted by gasping or choking sounds
Witnessed pauses in breathing reported by a bed partner
Waking with a dry mouth, sore throat, or headache
Excessive daytime sleepiness — falling asleep during routine activities such as reading, watching television, or driving
Difficulty concentrating, memory problems, or irritability
Waking frequently during the night to urinate
Restless or unrefreshing sleep despite spending adequate time in bed
Morning headaches caused by reduced oxygen levels during sleep

Left untreated, obstructive sleep apnea carries significant health consequences. It has been strongly associated with an increased risk of high blood pressure, heart disease, stroke, atrial fibrillation, type 2 diabetes, depression, and motor vehicle accidents caused by drowsy driving. Treating OSA is therefore not simply a matter of improving sleep quality — it is a meaningful investment in long-term health and safety.

Mandibular advancement devices are recommended as a primary treatment for mild to moderate OSA and as an alternative treatment for patients with severe OSA who are unable to tolerate the more commonly prescribed CPAP therapy.

Upper Airway Resistance Syndrome
Upper airway resistance syndrome — UARS — is a condition that falls between simple snoring and frank sleep apnea. Patients with UARS experience increased resistance to airflow during sleep that causes repeated microarousals — brief interruptions of deep sleep — without the complete breathing pauses seen in OSA. Symptoms closely mirror those of sleep apnea, including daytime fatigue, unrefreshing sleep, and difficulty concentrating. Mandibular advancement devices can be an effective treatment for this condition as well.

Snoring and Sleep Apnea in Special Populations
Mandibular advancement devices are particularly well suited for certain groups of patients:

CPAP-intolerant patients: Continuous positive airway pressure — CPAP — is widely considered the gold standard treatment for moderate to severe OSA and works by delivering a continuous stream of pressurized air through a mask worn over the nose or face during sleep to keep the airway open. While CPAP is highly effective, many patients struggle to tolerate the mask, the pressure, the noise, or the sensation of forced air — and studies consistently show that a significant proportion of prescribed CPAP users are not using their devices adequately. For these patients, a mandibular advancement device offers a proven and far more comfortable alternative that they are much more likely to use consistently.
Frequent travelers: CPAP machines require a power source, are bulky to transport, and require distilled water for the humidifier. A mandibular advancement device fits in a small case and can be used anywhere — making it ideal for patients who travel frequently for work or leisure.
Patients with positional sleep apnea: Some patients experience OSA primarily or exclusively when sleeping on their back. Mandibular advancement therapy can be particularly effective in this group.
Patients with mild to moderate OSA: Current clinical guidelines from sleep medicine organizations support oral appliance therapy as a first-line treatment for mild to moderate obstructive sleep apnea, either as a primary option or when CPAP is not tolerated or preferred.

The Importance of a Proper Sleep Apnea Diagnosis

Before a mandibular advancement device is fabricated, it is essential that patients with suspected sleep apnea undergo a formal sleep study — called a polysomnogram or home sleep apnea test — to confirm the diagnosis and determine its severity. This is important for several reasons.

First, many of the symptoms of sleep apnea — fatigue, poor concentration, morning headaches — can be caused by other medical conditions, and a sleep study ensures the correct diagnosis is made. Second, the appropriate treatment for sleep apnea depends on its severity — mild, moderate, or severe — and a formal diagnosis is necessary to guide that decision. Third, for patients with severe OSA, CPAP remains the most effective treatment, and a sleep physician should be involved in determining whether oral appliance therapy is appropriate.

If you suspect you may have sleep apnea, your dentist will refer you to a sleep physician for evaluation before proceeding with appliance fabrication. Conversely, if you have already been diagnosed with sleep apnea by a sleep physician, you can be referred directly to a dental sleep medicine provider for oral appliance therapy.

Types of Mandibular Advancement Devices

All mandibular advancement devices work on the same fundamental principle — holding the lower jaw forward during sleep — but they vary in their design, materials, and degree of adjustability.

Custom-Fabricated Devices
Custom-fabricated mandibular advancement devices — made from precise impressions or digital scans of a patient’s own teeth — are the gold standard for oral appliance therapy. Because they are made to fit the exact anatomy of the individual patient’s teeth, they are significantly more comfortable, more effective, and more durable than any over-the-counter alternative. Custom devices are provided by dental professionals trained in dental sleep medicine and are the only type endorsed by sleep medicine organizations for the treatment of sleep apnea.

Most custom mandibular advancement devices consist of two separate components — one that fits over the upper teeth and one that fits over the lower teeth — connected or held in relationship to each other by a mechanism that positions the lower jaw forward. Key features of well-designed custom devices include:

Titratability: The ability to adjust the degree of jaw advancement in small, precise increments — either by the patient at home or by the dentist at follow-up appointments — until the optimal therapeutic position is found. This is one of the most important features of a high-quality device, as the correct amount of advancement varies from patient to patient and often requires fine-tuning over time.
Vertical opening control: The device controls not only how far forward the jaw is positioned but also how far apart the upper and lower teeth are held, which affects both comfort and efficacy.
Lateral movement freedom: High-quality devices allow some degree of side-to-side jaw movement during sleep, which improves comfort and reduces the risk of jaw joint discomfort.
Durability: Custom devices are made from medical-grade materials designed to withstand the forces of normal jaw activity during sleep for several years.

Over-the-Counter Devices
Over-the-counter boil-and-bite devices — which are softened in hot water and then molded to the teeth by biting into them — are widely available at pharmacies and online. While they are inexpensive and accessible, they are not recommended for the treatment of diagnosed sleep apnea. They fit less precisely, are not titratable, are less durable, and have not been shown in research to be reliably effective for OSA. They may provide some benefit for simple snoring without sleep apnea, but patients should discuss even this use with their dental provider before relying on an over-the-counter device.

How Is a Mandibular Advancement Device Made and Fitted?

The process of obtaining a custom mandibular advancement device typically takes place over several appointments:

Appointment 1 — Dental Evaluation

Your dental sleep medicine provider will conduct a thorough evaluation of your oral health before fabricating an appliance. This includes an assessment of your teeth, gums, jaw joints — called the temporomandibular joints or TMJ — and the range of motion of your jaw. Certain conditions may affect your suitability for oral appliance therapy or require management before treatment begins:

Patients with insufficient teeth — or teeth that are too mobile due to gum disease — may not have adequate anchorage for a device
Patients with significant pre-existing jaw joint problems or severe teeth grinding may require special considerations
Active gum disease or significant untreated dental decay should be addressed before an appliance is made

If no contraindications are identified and oral appliance therapy is deemed appropriate, impressions or digital scans of both the upper and lower teeth are taken, along with a bite registration that captures the relationship between the upper and lower jaws. This bite registration is used to set the starting position of jaw advancement — typically around 50 to 70 percent of the patient’s maximum protrusive — forward — jaw movement, which is the range research suggests is both comfortable and effective as a starting point.

Appointment 2 — Delivery and Fitting

When the custom device is returned from the dental laboratory — typically two to three weeks after the impressions — it is carefully fitted and adjusted at a delivery appointment. Your provider will seat the device in your mouth, check the fit on both arches, verify that it is holding the jaw in the intended position, and make any necessary adjustments to ensure comfort. You will be shown how to insert and remove the device, how to clean it, and what to expect during the adjustment period.

You will also be given instructions for a gradual acclimatization schedule — wearing the device for increasing periods each night over the first one to two weeks — to allow your teeth, jaw muscles, and joints to adapt comfortably.

Follow-Up Appointments — Titration

Titration — the process of gradually advancing the lower jaw to find the optimal therapeutic position — is one of the most important aspects of oral appliance therapy and a key factor in its success. Most devices are not set to their final position at delivery; instead, advancement is increased incrementally over several weeks or months based on your response to treatment.

Your provider will schedule follow-up appointments — typically every two to four weeks initially — to assess your progress, check for any signs of jaw discomfort or bite changes, and adjust the degree of advancement as needed. The goal is to find the position at which snoring is eliminated and sleep apnea events are adequately reduced, while maintaining comfort during wear.

Objective Outcome Verification

Once a stable and comfortable position has been established, a follow-up sleep study is recommended to objectively confirm that the device is providing adequate therapeutic benefit. This is an important step that distinguishes responsible oral appliance therapy from simply wearing a device without verification of its effectiveness. The sleep study may be a full in-lab polysomnogram or a home sleep apnea test, depending on the clinical situation and your sleep physician’s recommendation.

If the follow-up sleep study shows that the device is providing sufficient control of sleep apnea events, the current position is maintained and regular monitoring continues. If further improvement is needed, additional titration may be performed.

After Root Canal Treatment — The Importance of a Crown

In the vast majority of cases, a tooth that has undergone root canal treatment will need to be protected with a dental crown following the procedure. This is a critical step that many patients underestimate in importance.

There are several reasons why a crown is typically necessary:

Structural protection: The access opening created during root canal treatment, combined with any pre-existing decay or prior restorations, leaves the tooth significantly weakened. Back teeth — molars and premolars — endure tremendous chewing forces, and an unprotected root canal-treated tooth is highly susceptible to fracture. A fracture that extends below the gumline can result in the loss of the tooth entirely — the very outcome the root canal treatment was designed to prevent.
Sealing against recontamination: A crown provides a durable, long-term seal over the access opening, protecting the treated canal system from bacterial recontamination.
Restoring function and appearance: A well-fitting crown restores the tooth to its full shape, size, and chewing function, and in the case of front teeth, its natural appearance.

Front teeth — which bear less chewing force — may sometimes be restored with a large filling rather than a crown, depending on how much natural tooth structure remains. Your dentist will assess the specific condition of your tooth and recommend the most appropriate restoration.

The crown is typically placed two to four weeks after root canal treatment, once any post-operative sensitivity has fully resolved and the tooth is confirmed to be healing well.

What Can You Expect When Starting Oral Appliance Therapy?

Adjusting to a mandibular advancement device takes time and patience for most patients. The following experiences are common and expected during the initial weeks of treatment:

Increased Salivation
The presence of the appliance in the mouth stimulates saliva production, which many patients notice as excessive drooling during the first few weeks of use. This is a normal adaptation response and almost always resolves within two to four weeks as the mouth adjusts to the new appliance.

Dry Mouth
Conversely, some patients experience dry mouth — particularly if they breathe through their mouth during sleep. Staying well hydrated before bed and discussing the use of a humidifier with your provider can help manage this.

Morning Jaw Soreness and Tooth Sensitivity
Mild soreness in the jaw muscles and joints, and some tooth tenderness, are very common during the early weeks of treatment as the muscles and joints adapt to the new jaw position. This typically improves significantly as treatment progresses. Performing gentle jaw stretching exercises each morning — which your provider will demonstrate — helps alleviate this discomfort and restore the jaw to its natural resting position after the device is removed.

Temporary Morning Bite Changes
Many patients notice that their bite feels different — and their teeth do not come together normally — for a period of time each morning after removing the device. This is caused by the jaw muscles and ligaments temporarily retaining the advanced position of the jaw after a night of wearing the appliance. The bite typically returns to normal within thirty minutes to a few hours and can be assisted by performing the morning jaw exercises provided by your dentist. This is an expected and manageable side effect for most patients.

Adjustment Period
Most patients require two to four weeks to fully adapt to sleeping with the device in place. Sleep may be mildly disrupted during the first few nights as the brain adjusts to the sensation of the appliance. Persistence through this adjustment period is important — the vast majority of patients who continue to use the device find that comfort and sleep quality improve steadily and meaningfully over the first month.

A mandibular advancement device is a small appliance with a potentially profound impact — on your sleep, your energy, your health, and your quality of life. For the right patient, it offers an effective, comfortable, and convenient path to the restorative sleep that the body depends on every night. Your dental and medical team will work together to make sure your treatment is tailored precisely to your needs and monitored carefully over time for the best possible long-term outcome.

Potential Side Effects and Long-Term Considerations

Mandibular advancement devices are safe and well tolerated by the great majority of patients, but there are some side effects and considerations to be aware of:

Jaw Joint Discomfort
Some degree of jaw joint soreness — particularly in the morning — is common during the early weeks of treatment and usually resolves as the jaw adapts. In a small number of patients, more persistent jaw joint discomfort develops and may require modification of the appliance position, a temporary reduction in wear time, or additional management. Patients with pre-existing temporomandibular joint disorder should discuss this with their provider before beginning oral appliance therapy.

Tooth Movement and Bite Changes
Long-term use of a mandibular advancement device can in some patients cause gradual changes in tooth position and bite relationship — most commonly a slight reduction in overbite as the lower front teeth are drawn forward relative to the upper front teeth. These changes are usually very subtle and develop slowly over years of use, but they are permanent and should be monitored. Your dental provider will assess for bite changes at regular follow-up appointments. Morning repositioning exercises and in some cases a small bite plate worn briefly each morning can help manage and minimize these changes.

Tooth and Gum Sensitivity
Some patients experience sensitivity in the teeth or gum tissue that contacts the appliance, particularly during the early stages of treatment. This usually resolves as the fit is refined and the tissues adapt.

Device Wear and Replacement
Custom mandibular advancement devices are durable but not permanent. Most devices last three to five years before the materials show sufficient wear or the fit changes enough to warrant replacement. Changes in dental work — new crowns, extractions, or significant changes in tooth position — can also affect the fit of the device and may require modification or replacement.

Caring for Your Mandibular Advancement Device

Proper daily care keeps your device clean, hygienic, and functioning well:

Rinse the device with cool or lukewarm water immediately upon removing it each morning — never hot water, which can warp the material
Brush the device gently with a soft toothbrush and mild dish soap or a dedicated appliance cleaner — avoid regular toothpaste, which is abrasive and can scratch the surface
Soak the device regularly in a denture cleaning solution or specialized appliance cleaner to prevent bacterial and mineral buildup — follow your provider’s specific recommendations for soaking frequency and duration
Store the device in its case when not in use to protect it from damage, warping, and pet interference — dogs in particular are notorious for finding and destroying oral appliances
Brush and floss your teeth thoroughly before inserting the device each night — placing a clean appliance over unbrushed teeth traps bacteria against the tooth surfaces
Bring the device to every dental appointment so your provider can inspect it for wear, verify the fit, and assess for any bite changes

Working With Your Healthcare Team

Oral appliance therapy for sleep apnea is most effective when it is managed collaboratively between your dental sleep medicine provider and your sleep physician. Your dentist fabricates and adjusts the device and monitors your oral health and bite over time, while your sleep physician oversees the medical aspects of your sleep apnea diagnosis, treatment, and long-term follow-up. Regular communication between these two providers ensures that your treatment is both dentally sound and medically effective.

If at any point your symptoms return — if snoring resumes, daytime sleepiness worsens, or your bed partner notices pauses in breathing — contact both your dental provider and sleep physician promptly. Symptoms returning during established oral appliance therapy may indicate that the device requires titration adjustment, has worn to the point of needing replacement, or that the nature of your sleep apnea has changed and requires reassessment.