Anti-snoring mouthpieces and oral appliances: how they work and who they suit

An anti-snoring mouthpiece, usually a mandibular advancement device, holds your lower jaw slightly forward while you sleep so your tongue can't sag back and narrow your airway. Sleep medicine guidelines recommend them for adults who snore without sleep apnea, and they work best when a dentist fits one after a doctor rules sleep apnea out. They suit throat and tongue snoring, not a blocked nose.

How does an anti-snoring mouthpiece work?

When you fall asleep, the muscles in your throat relax. The NHS says that if your tongue partly blocks the back of your throat, the fix is a device worn in the mouth that brings the tongue forward. That device is a mandibular advancement device.

The 2015 clinical practice guideline from the American Academy of Sleep Medicine (AASM) and the American Academy of Dental Sleep Medicine (AADSM) defines oral appliances as devices that push the lower jaw forward and hold it steady to keep the airway open during sleep. Cleveland Clinic describes them as mouthguard-style devices that hold your lower jaw forward.

A few related devices work differently. Tongue retaining devices hold the tongue itself forward, and the AASM guideline treats them as a separate category. The NHS also lists a vestibular shield, a device worn in the mouth to make you breathe through your nose, for people whose mouth falls open as they sleep.

Do anti-snoring mouthpieces work?

Anti-snoring mouthpieces do work for many people, and the research is stronger than for most snoring fixes. The AASM and AADSM guideline recommends that sleep physicians prescribe an oral appliance, rather than no therapy, for adults who ask for treatment of snoring without sleep apnea. It rates the quality of evidence behind that recommendation as high, and says oral appliances reduce how often and how loudly people snore, improve sleep quality for snorers and their bed partners, and improve quality of life measures.

A 2019 German guideline on snoring in adults, published in Deutsches Ärzteblatt International, reached a similar view. It recommends a mandibular advancement device for suitable patients who want treatment, at its highest recommendation grade. In one randomized trial it summarizes, the median snoring index fell from 398 to 17 with a real device and didn't change with a sham device that didn't move the jaw. In another, both how often and how loudly people snored dropped with the real device.

The German guideline is also frank that the wider evidence on snoring treatments is limited, because most studies are small and short. Mouthpieces are one of the better-studied options within that.

Who do anti-snoring mouthpieces suit?

Anti-snoring mouthpieces suit people whose snoring comes from the tongue and soft tissue at the back of the throat, once sleep apnea has been ruled out. The AASM guideline says a sleep physician, not a dentist, should diagnose simple snoring, because snoring often comes with sleep apnea and getting that wrong can have serious consequences. It also frames oral appliances as the next step for snorers who have already tried conservative measures such as weight loss, changing sleep position and avoiding alcohol.

Your teeth and jaw matter too. The German guideline sets out conditions for using a mandibular advancement device:

• Enough stable teeth in each jaw, free of decay and gum disease, or enough sturdy dental implants
• The ability to open your mouth normally
• No problems found when the jaw joint and chewing muscles are checked

If you have loose teeth, ongoing jaw pain or a lot of dental work in progress, talk to a dentist before buying anything.

Are custom or boil-and-bite mouthpieces better?

The evidence leans toward custom mouthpieces over boil-and-bite ones. For people with sleep apnea, the AASM guideline suggests a qualified dentist use a custom, adjustable appliance rather than a non-custom one. Adjustable devices let the dentist move the jaw forward a little at a time, which the guideline compares to adjusting the pressure on a CPAP machine.

For snoring, the German guideline says thermoplastic (boil-and-bite) splints are viewed critically in terms of how long they last and how well they work. It adds that one randomized trial did find a partly adjustable thermoplastic splint effective, and that solid long-term data on ready-made splints wasn't available. Cleveland Clinic's advice is to work with a dentist or oral surgeon to have one customized, warning that a badly fitting appliance can strain the jaw.

Are anti-snoring mouthpieces safe, and what are the side effects?

Anti-snoring mouthpieces are generally safe, and most side effects are dental. The AASM guideline lists sore teeth, gum problems, sore jaw muscles, too much saliva, difficulty chewing in the morning, dry mouth and changes in how your teeth meet. It also notes that oral appliances can aggravate jaw joint problems.

That's why the guideline suggests follow-up with a qualified dentist to check for side effects and changes to your bite. In people with sleep apnea, it also found that side effects serious enough to make people stop were less common with oral appliances than with CPAP. Go in expecting a device you'll have checked over time.

How do mouthpieces compare with nasal strips and mouth tape?

Mouthpieces, nasal strips and mouth tape work on different parts of the airway, so the right choice depends on why you snore. The NHS matches each cause to its own fix. A tongue blocking the throat points to a mandibular advancement device. Blocked or narrow nasal passages point to nasal dilators or strips. A mouth that falls open during sleep points to a chin strap or a device that keeps you breathing through your nose.

Nasal strips are the simplest place to start if your nose feels blocked at night. In a small randomized trial of 12 people with chronic rhinitis, snoring dropped from about 258 snores an hour with a placebo strip to 173 with a real one, though loudness didn't change. Our guide to how nasal strips work explains the mechanics, and nasal strips vs. a mouth guard compares the two directly.

Mouth tape is a low-cost option for adults whose mouth falls open at night and who breathe comfortably through their nose. A 2025 systematic review found three studies that measured snoring after the mouth was kept closed with tape or a chin strap, and all three reported a significant drop. The reviewers called the overall evidence minimal and warned about risks for anyone with a blocked nose, so a clear nose comes first. Take our two-minute nose test, then see how to start mouth taping. If you already wear a night guard, read mouth tape with a night guard.

If you want to try mouth tape and nasal strips together, our pick is the Titan Sleep System, which pairs TitanAir Nasal Strips with Titan Mouth Tape.

Neither strips nor tape treat sleep apnea. Oral appliances are different here: they are a recognized sleep apnea treatment, but only when a sleep physician prescribes one. The AASM guideline says CPAP works better and should be the first option, with oral appliances for people who can't tolerate CPAP or prefer an alternative. Our overview of sleep apnea treatment options covers the choices.

When should you see a doctor first?

See a doctor before buying a mouthpiece if your snoring comes with warning signs. The AASM says snoring paired with choking, gasping or silent pauses in breathing is a reliable indicator of sleep apnea, and it lists excessive daytime sleepiness as another sign. The NHS adds breathing that stops and starts in your sleep, and snoring that has a big impact on your life or your partner's.

A mouthpiece that quiets the snoring can hide those signs without fixing the cause. Our guide to snoring vs. sleep apnea explains the difference, and the home sleep apnea test guide covers what testing involves.

Read next

• How to stop snoring
• Mouth tape vs. chin strap
• Sleep position and snoring

* This content is for informational and educational purposes only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease or health condition. Talk to a qualified healthcare provider about your health.