Open-mouth snoring happens when your jaw relaxes during sleep, air flows through your mouth instead of your nose, and the soft tissue in the back of your throat vibrates. The good news: several approaches can reduce or eliminate it, ranging from simple positional changes to devices that keep your mouth closed or your airway open. The right fix depends on why your mouth is opening in the first place.
Why Your Mouth Opens During Sleep
During sleep, your muscle tone drops throughout your body, including the muscles that hold your jaw closed and keep your tongue forward. As these muscles relax, your jaw falls open and your tongue slides backward. In that position, the soft palate forms a wedge between the base of the tongue and the back of the throat, creating narrow slit-like channels for air. When air is forced through these tight spaces, the surrounding tissue vibrates and produces the sound of snoring.
Nasal congestion makes this worse. If your nose is partially blocked from allergies, a deviated septum, or dry air, breathing through your nose requires more effort. Your body takes the path of least resistance and routes airflow through your open mouth instead. Higher nasal resistance is directly linked to increased snoring, so anything that clears your nasal passages can help keep your mouth closed naturally.
Mouth Taping: What the Evidence Shows
Mouth taping has gained popularity as a simple, inexpensive way to encourage nasal breathing during sleep. You place a small strip of porous medical tape (not duct tape or packing tape) vertically over your lips before bed. The idea is that the light adhesive reminds your body to breathe through your nose.
A clinical study of mouth-breathers with mild sleep apnea found that mouth taping reduced snoring events by 47%, cutting the snoring index roughly in half. It also reduced breathing disruptions by a similar margin. Notably, the people who snored the most at baseline saw the greatest improvement.
That said, mouth taping is not safe for everyone. It’s not recommended if you have moderate or severe sleep apnea, since blocking the mouth could be dangerous when the nasal airway is also compromised. People with severe nasal congestion, allergies to adhesives, or jaw alignment issues should also avoid it. If you want to try it, start with a single night using gentle, porous surgical tape and confirm you can breathe comfortably through your nose while awake with your mouth closed.
Chin Straps Are Mostly Ineffective
Anti-snoring chin straps wrap around your head and hold your jaw shut. They seem like a logical solution, but clinical data tells a different story. A study published in the Journal of Clinical Sleep Medicine found that chin straps alone did not improve snoring or sleep-disordered breathing, even in people with mild cases. The snoring index showed no significant change with the strap on versus off.
One possible explanation: simply closing the mouth doesn’t address what’s happening deeper in the airway. The soft palate and tongue base can still collapse and vibrate even when the jaw is held shut. In isolated cases, closing the mouth has improved airway space behind the tongue, but this doesn’t appear to work reliably across most people.
Open Your Nasal Passages First
Since nasal congestion is one of the most common reasons people default to mouth breathing, improving nasal airflow can solve the problem at its source. You have two main mechanical options: external nasal strips that pull the nostrils open from outside, and internal nasal dilators (small cone-shaped inserts you place inside each nostril).
Internal dilators tend to work better. One comparative study found that internal nasal cones increased inspiratory airflow by 110% over baseline, roughly double the improvement provided by external adhesive strips. Both are worth trying, but if external strips aren’t making a noticeable difference, switching to an internal dilator may help.
Beyond mechanical aids, keeping your bedroom humidity between 30% and 50% prevents your nasal passages from drying out overnight. A simple bedside humidifier can make a real difference, especially in winter or in dry climates. If you have chronic nasal congestion from allergies, treating the underlying inflammation with a nasal corticosteroid spray (available over the counter) often reduces the need to mouth-breathe.
Sleep on Your Side
Sleeping on your back lets gravity pull your tongue and jaw straight down into your airway, making open-mouth snoring significantly worse. Switching to your side roughly cuts the snoring rate in half. One study of position-dependent snorers found that the snoring rate dropped from 36.7% to 15.7% of total sleep time when participants stayed off their backs.
The challenge is staying on your side all night. Positional therapy devices, such as inflatable vests or wearable bumpers that make back-sleeping uncomfortable, help enforce the habit. A low-tech alternative: sewing a tennis ball into the back of a sleep shirt or placing a firm pillow behind you. Over time, many people train themselves to prefer side sleeping without needing a device.
Mandibular Advancement Devices
A mandibular advancement device (MAD) is a mouthpiece you wear during sleep that pushes your lower jaw slightly forward. This pulls your tongue forward too, opening more space in the back of your throat and reducing tissue vibration. MADs are one of the most widely recommended non-surgical treatments for snoring and mild to moderate sleep apnea.
Custom-fitted devices made by a dentist offer the best results. Over-the-counter “boil and bite” versions exist and may provide some benefit, but research consistently shows custom appliances are more effective and more comfortable for long-term use. Because MADs physically reposition the jaw, they address open-mouth snoring more directly than chin straps, which merely hold the mouth closed without changing the airway geometry.
Tongue and Throat Exercises
Myofunctional therapy, a set of exercises targeting the tongue, soft palate, and throat muscles, has shown real results for snoring. A meta-analysis of 211 adults found that these exercises reduced snoring intensity by 51% and total time spent snoring by 31%. The exercises strengthen the muscles that go slack during sleep, making your airway less likely to collapse.
Common exercises include pressing the tongue firmly against the roof of the mouth and sliding it backward, pronouncing certain vowel sounds repeatedly to engage the throat, and inflating a balloon using only your breath (which strengthens the soft palate). Most studies had participants practice for about 10 to 15 minutes a day over several weeks before seeing improvement. The effects aren’t instant, but they address the root cause of muscle weakness rather than just working around it.
When Snoring May Be Sleep Apnea
Not all open-mouth snoring is harmless. Snoring is the most common symptom of obstructive sleep apnea, a condition where your airway repeatedly collapses during sleep, briefly stopping your breathing. The severity is measured by how many times per hour your breathing is disrupted: 5 to 14 times is mild, 15 to 30 is moderate, and above 30 is severe.
Importantly, the severity doesn’t always match what you’d expect from someone’s anatomy or medical history. A person who seems like a “simple snorer” can have significant apnea. If your snoring is loud and irregular, if you wake up gasping or choking, if you feel exhausted during the day despite getting enough hours of sleep, or if a partner notices pauses in your breathing, a sleep study is the only way to know for certain. Many can now be done at home with a portable monitoring device.
Surgical Options for Persistent Cases
If structural problems in your nose or throat are driving your mouth breathing and snoring, surgery can sometimes provide a lasting fix. The most common procedures are turbinate reduction (shrinking swollen tissue inside the nose), septoplasty (straightening a deviated septum), and procedures to stiffen or reposition the soft palate. These are typically considered only after conservative approaches like positional therapy, nasal dilators, and oral appliances haven’t worked well enough. An ENT specialist can evaluate your specific anatomy and recommend whether a procedure makes sense for your situation.