Anti-Snoring Mouthguard Side Effects: What to Expect and How to Manage Them

Anti-snoring mouthguards, also known as mandibular advancement devices (MADs), are one of the most effective non-surgical treatments for snoring. Research consistently shows they reduce snoring in the majority of users. However, like any oral appliance, they come with an adjustment period and potential side effects that you should understand before committing to nightly use.

Having tested over 40 different anti-snoring devices, I have personally experienced nearly every side effect on this list. The good news is that most are temporary, manageable, and well worth tolerating given the benefits of quieter, more restful sleep. This guide walks you through exactly what to expect, when side effects are normal, and when they signal something that needs professional attention.

Common Side Effects in the First Week

The first week of wearing an anti-snoring mouthguard is the most challenging period for most users. Your mouth, jaw muscles, and teeth are adjusting to a device that holds your lower jaw in a position it is not accustomed to. A 2021 study published in the Journal of Clinical Sleep Medicine found that approximately 70% of new MAD users report at least one side effect during the initial adaptation period, but the vast majority of these effects resolve within two to three weeks.^[1]

The most frequently reported first-week side effects include:

• Jaw soreness or stiffness upon waking, similar to the feeling after a long dental procedure
• Excessive salivation during the night due to the mouth being held slightly open
• Mild tooth tenderness, particularly in the front teeth that bear the most contact with the device
• Dry mouth or throat irritation from altered breathing patterns during adjustment
• Temporary bite changes in the first 30 minutes after removing the device each morning

Jaw Pain and TMJ Discomfort

Jaw pain is the single most commonly reported side effect of mandibular advancement devices. MADs work by holding the lower jaw (mandible) in a forward position, which opens the airway behind the tongue. This forward positioning places sustained tension on the temporomandibular joint (TMJ) and the surrounding muscles throughout the night.

According to the Mayo Clinic, the temporomandibular joint acts as a sliding hinge connecting the jawbone to the skull. When this joint is held in an unfamiliar position for hours at a time, the muscles and ligaments need time to adapt.

What Normal Jaw Pain Feels Like

Normal adjustment-related jaw discomfort typically presents as a mild ache or stiffness that you notice immediately upon waking. It should feel similar to muscle soreness after exercise rather than sharp or shooting pain. This discomfort usually fades within 15 to 30 minutes of removing the device and performing gentle jaw stretches.

When Jaw Pain Becomes Concerning

You should seek professional guidance if jaw pain persists throughout the day, if you hear clicking or popping sounds that were not present before, if the pain intensifies rather than gradually improving over the first two weeks, or if you develop headaches that coincide with mouthguard use. These symptoms may indicate that the device is advancing your jaw too far forward or that you have an underlying TMJ condition that requires evaluation.

"Oral appliance therapy for snoring is generally well-tolerated, but patients with pre-existing TMJ disorders should undergo a thorough evaluation before beginning treatment. Proper device calibration is essential for minimizing jaw-related complications." -- American Academy of Sleep Medicine, Clinical Practice Guidelines for Oral Appliance Therapy^[2]

Excessive Drooling

Excessive drooling is one of the most universally experienced side effects, and it is also one of the most harmless. When you place a foreign object in your mouth, your salivary glands naturally increase production. Additionally, most MADs hold the mouth slightly open, which prevents you from swallowing saliva as efficiently as you normally would during sleep.

Studies indicate that increased salivation affects roughly 50 to 60% of new mouthguard users during the first two weeks.^[3] For most people, the body acclimates and drooling decreases significantly by the end of the third week. In the meantime, using an absorbent pillowcase or placing a small towel on your pillow can manage the inconvenience.

Tips to Reduce Drooling

• Try sleeping on your back rather than your side, as gravity helps keep saliva from pooling
• Practice wearing the device while awake for 30 minutes before bed to allow initial saliva production to settle
• Ensure the device fits snugly without gaps that encourage the mouth to open wider than necessary
• Consider a device with smaller breathing holes if your current mouthguard has large openings

Tooth Sensitivity and Bite Changes

Tooth sensitivity and temporary bite changes rank among the side effects that concern users the most, though they are generally benign when properly managed. MADs exert force on the teeth to maintain jaw advancement, and this pressure can cause mild tenderness, particularly in the incisors and canines.

A systematic review published in the Journal of Dental Sleep Medicine found that minor tooth movement and bite changes occur in a notable percentage of long-term MAD users, though these changes are typically small in magnitude and often not clinically significant.^[4] The American Dental Association recommends regular dental monitoring for anyone using an oral appliance for snoring or sleep apnea management.

Morning Bite Exercises

Most manufacturers recommend performing bite realignment exercises each morning after removing the device. These typically involve biting down on a provided bite tab or chewing device for one to two minutes. This practice helps your teeth and jaw return to their natural resting position and can prevent the accumulation of small positional changes over time. For guidance on proper fitting that minimizes tooth pressure, see our guide to fitting your anti-snoring mouthpiece.

Gag Reflex Issues

People with a sensitive gag reflex may find the initial experience of wearing a mouthguard particularly challenging. The device sits against the palate and tongue, which are areas densely populated with nerve endings that can trigger the gag reflex. This issue is more pronounced with bulkier, one-size-fits-all devices compared to slimmer, custom-molded options.

Desensitization techniques can be remarkably effective. Start by wearing the device for short periods during the day while watching television or reading. Gradually extend the duration over several days. Breathing slowly and deeply through your nose while focusing on relaxation can also help suppress the reflex. If gagging persists, consider switching to a tongue stabilizing device (TSD), which sits outside the mouth and avoids triggering the palatal reflex entirely.

How to Minimize Side Effects

While some adjustment period is inevitable, there are proven strategies to reduce the intensity and duration of side effects significantly. Based on clinical recommendations and my own extensive testing experience, here is a comprehensive approach to a smoother transition.

Start with Minimal Advancement

If your mouthguard offers adjustable advancement settings (as most quality devices do), begin with the lowest effective advancement setting. You can gradually increase the advancement over days or weeks until you find the sweet spot where snoring is controlled without excessive jaw strain. This graduated approach is recommended by the American Academy of Sleep Medicine for all oral appliance therapy.

Follow a Break-In Schedule

Rather than attempting to wear the device for a full eight hours on the first night, use a phased approach:

1. Days 1 to 3: Wear the device for 2 to 3 hours at the start of sleep. Remove it if discomfort wakes you.
2. Days 4 to 7: Extend to 4 to 5 hours nightly. Most side effects should be noticeably milder by day 5.
3. Week 2: Move to full-night use. Brief morning soreness is still normal at this stage.
4. Week 3 and beyond: Full adaptation for most users. Residual side effects should be minimal.

Maintain Excellent Oral Hygiene

Wearing a mouthguard creates a warm, moist environment that bacteria thrive in. Brush and floss thoroughly before inserting the device each night, and clean the mouthguard itself with cool water and a denture cleaner or mild soap each morning. This prevents gum irritation and reduces the risk of dental issues that could compound device-related discomfort.

Perform Morning Jaw Exercises

Spend two minutes each morning performing gentle jaw exercises after removing the device. Open your mouth wide, move your jaw side to side, and gently bite down several times. These movements help restore normal muscle tone and joint positioning after a night of advancement.

For a complete walkthrough of these techniques, our mouthpiece fitting guide covers the adjustment process in detail.

When Side Effects Signal a Problem

While most side effects are temporary nuisances, certain symptoms warrant immediate attention. Understanding the difference between normal adjustment and a genuine problem is critical for your oral health and safety.

Contact your dentist or physician if you experience any of the following:

• Severe or worsening jaw pain that does not improve over two weeks and affects eating or daily activities
• Persistent bite changes that last more than an hour after morning device removal
• Tooth loosening or significant shifting that you can visually observe
• Bleeding gums or gum recession around teeth in contact with the device
• TMJ clicking or locking that was not present before you began using the mouthguard
• Worsening of snoring or new symptoms such as gasping or choking, which may indicate the device is not adequately addressing an underlying condition like obstructive sleep apnea

The Cleveland Clinic emphasizes that oral appliances should be monitored by a dental professional, especially for the first year of use. If your device is causing more problems than it solves, a different type of device or an alternative treatment approach may be more appropriate. Our mouthguard versus chin strap comparison explores alternative options worth considering.

Frequently Asked Questions

How long do anti-snoring mouthguard side effects last?

Most side effects such as jaw soreness, excess drooling, and mild tooth sensitivity resolve within 1 to 3 weeks of consistent nightly use. The body adapts to the device much like it adapts to orthodontic appliances. If side effects persist beyond 4 weeks, consult your dentist for a fit adjustment or to explore whether a different device type may suit you better.

Can an anti-snoring mouthguard damage your teeth?

When properly fitted and used as directed, anti-snoring mouthguards rarely cause permanent tooth damage. However, poorly fitting devices or long-term use without regular dental supervision can lead to minor bite changes or tooth movement over time. This is why clinical guidelines emphasize the importance of routine dental monitoring.^[5]

Is jaw pain from a snoring mouthpiece normal?

Mild jaw soreness during the first 1 to 2 weeks is very common and expected. The device holds your jaw in a forward position that your muscles are not accustomed to, similar to the feeling of starting a new exercise routine. Persistent or severe pain that affects eating or does not improve warrants professional evaluation.

Should I stop using my mouthguard if I experience side effects?

Not necessarily. Mild side effects are a normal part of the adjustment process and typically indicate your body is adapting. You should stop use and consult a dental professional if you experience severe pain, significant bite changes that persist well into the day, bleeding gums, or any tooth loosening.

Do TSDs cause fewer side effects than MADs?

Tongue Stabilizing Devices (TSDs) typically cause fewer jaw-related side effects because they do not reposition the jaw. They work by holding the tongue forward using gentle suction. However, TSDs may cause tongue soreness, increased drooling, and difficulty breathing through the mouth. The best choice depends on your anatomy and which side effects you find more tolerable. Our MAD versus TSD comparison guide provides a detailed breakdown.

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Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. Anti-snoring mouthguards may not be appropriate for everyone. If you suspect you have sleep apnea or a TMJ disorder, consult a qualified healthcare professional before beginning any treatment. Always follow the manufacturer's instructions and seek dental supervision for ongoing oral appliance use.