Yes, there are mouth guards designed specifically to treat obstructive sleep apnea. They’re formally called oral appliances, and they work by repositioning your jaw or tongue to keep your airway open while you sleep. For about 70% of people with obstructive sleep apnea, these devices cut the severity of their condition by more than half. For roughly a third, they resolve symptoms entirely.
How Oral Appliances Work
Sleep apnea happens when soft tissue in the back of your throat collapses during sleep, blocking airflow. Oral appliances prevent this by physically holding structures in your mouth forward so the airway stays open. There are two main types.
Mandibular advancement devices (MADs) are by far the more common option. They fit over your upper and lower teeth, similar to a sports mouth guard but in two connected pieces. The device holds your lower jaw in a slightly forward position, which also pulls your tongue forward, creating more space for air to flow through the back of your throat. Most MADs have an adjustment mechanism that lets you gradually increase how far your jaw is advanced, in increments of one millimeter or less, until you find the position that controls your symptoms.
Tongue-stabilizing devices (TSDs) take a different approach. Instead of moving your jaw, they use a suction bulb to hold your tongue in a forward position. The tip of the device sits outside your mouth. These are less commonly prescribed and tend to be used when jaw advancement isn’t an option.
Who They Work Best For
Oral appliances have traditionally been recommended for mild to moderate sleep apnea, and that’s where the strongest evidence sits. In studies of people with mild to moderate cases, 72% saw their breathing disruptions drop below 10 events per hour, which is the threshold for mild apnea. When compared head-to-head with CPAP in mild sleep apnea, oral appliances performed nearly as well: 62% of the oral appliance group achieved fewer than 5 events per hour, compared to 76% with CPAP.
The gap widens as severity increases. In moderate cases, CPAP brought 71% of users below 5 events per hour versus 51% for oral appliances. In severe cases, those numbers were 63% versus 40%. That said, there’s growing evidence that oral appliances can still be effective for some people with severe sleep apnea, particularly those who can’t tolerate CPAP. A device you actually wear every night will always outperform one that stays in the closet.
Certain conditions rule out oral appliance use entirely. The FDA lists these contraindications: central sleep apnea (a different condition where the brain, not the throat, causes breathing pauses), severe respiratory disorders, loose teeth or advanced gum disease, and being under 18.
Custom-Fitted vs. Over-the-Counter Devices
You can find inexpensive “boil and bite” mouth guards marketed for snoring and sleep apnea online and in pharmacies. Sleep specialists generally don’t recommend them. These one-size devices typically don’t fit well, are uncomfortable, and may reduce snoring without actually treating the underlying airway obstruction. That can create a false sense of security where you or your bed partner think the problem is solved because the snoring quieted down, but you’re still experiencing dangerous pauses in breathing.
Custom-fitted, two-piece MADs allow precise adjustments and tend to be more comfortable and more effective than one-piece alternatives. They’re made from impressions or digital scans of your teeth and calibrated to your specific jaw anatomy. The total cost typically runs $1,500 to $2,500, including the fitting, the device, and follow-up appointments. Insurance can reduce that significantly. Medicare covers custom-fabricated oral appliances under a specific equipment code, but only mandibular advancement devices that meet certain technical criteria. Tongue-retaining devices are not covered as durable medical equipment under Medicare.
The Fitting and Adjustment Process
Getting an oral appliance isn’t as simple as picking one up and wearing it. You’ll need a sleep study confirming obstructive sleep apnea, then a referral to a dentist trained in dental sleep medicine. The dentist takes impressions or digital scans of your teeth and bite, which are used to fabricate your custom device.
Once you have the appliance, it needs to be titrated, meaning the jaw advancement is gradually increased until your breathing events are controlled. Older protocols stretched this process over three to four months, but newer approaches using at-home sleep monitoring can find the right setting in about a month. One protocol has patients advance the device by 1 millimeter each night over five nights while wearing a finger sensor that tracks breathing disruptions. This data pinpoints the effective position quickly. Most people only need about 60% of the maximum possible advancement to get a significant effect, so the device doesn’t have to push your jaw as far forward as it can go.
After optimization, you’ll need periodic follow-ups to check both the device and your teeth. Adjustments beyond the first 90 days may not be covered by Medicare, so it’s worth confirming your insurance terms upfront.
Side Effects and Long-Term Changes
Short-term side effects are common but usually manageable. Most people experience some jaw tenderness and morning stiffness when they first start wearing a MAD. This typically improves as your muscles adapt over the first few weeks. Stretching exercises in the morning can help restore normal jaw movement.
Long-term changes are more significant and worth understanding before you commit. Research from the American Thoracic Society found that 81% of MAD users develop some dental side effects within five years. The most notable changes involve your bite: the horizontal overlap of your front teeth decreases by an average of 2.6 millimeters, and the vertical overlap drops by about 2.8 millimeters. In practical terms, your lower front teeth may tilt forward while your upper front teeth tip backward. Some people develop a gap where their front teeth no longer touch when they bite down.
Some users develop clicking or popping in the jaw joint, though this often doesn’t cause pain. Interestingly, across 13 clinical studies, no patients stopped MAD therapy solely because of jaw joint problems. The side effect that does force people to quit is persistent, sharp jaw pain that interferes with eating and speaking. This is different from the initial soreness, and when it doesn’t respond to device adjustments, it can outweigh the sleep benefits.
These bite changes are a trade-off, not necessarily a dealbreaker. For many people, the health consequences of untreated sleep apnea (cardiovascular strain, daytime fatigue, cognitive impairment) are far more serious than gradual shifts in tooth alignment. But it’s something to discuss with your dentist and monitor over time, especially if you’re younger and may use the device for decades.