Sleep Apnea Mouthpiece vs. CPAP

Short answer: CPAP is the standard treatment for obstructive sleep apnea and the usual first choice, especially in moderate to severe cases. An oral appliance prescribed and fitted by a dentist is an established alternative for some people, most commonly those with mild to moderate obstructive sleep apnea or those who cannot tolerate CPAP. Which one is right for you is a decision to make with your doctor after a proper diagnosis, not from a web page.

One distinction matters before anything else. The over-the-counter mouthpieces reviewed on this site are sold to reduce snoring. They are not a treatment for sleep apnea, and they are not the same thing as a dentist-fitted oral appliance, even though they work on a similar principle.

Sleep Apnea Needs a Diagnosis First

Sleep apnea is a sleep disorder in which breathing repeatedly pauses or becomes very shallow during sleep. There are two main types:

• Obstructive sleep apnea (OSA), the most common type, in which the tissues of the throat block the airway.
• Central sleep apnea, in which the brain does not send the right signals to the muscles that control breathing.

Some people have a combination of both. The type matters, because oral appliances are aimed at the obstructive kind. They hold the airway open mechanically and do nothing about the signalling problem behind central sleep apnea.

Snoring on its own is not sleep apnea, but loud snoring is one of its common signs. See a doctor if snoring comes with pauses in breathing that a partner notices, gasping or choking in the night, morning headaches, or heavy sleepiness during the day. Untreated sleep apnea is linked to serious health problems, which is why guessing is a bad idea. The diagnosis is made with a sleep study, arranged through your doctor or a sleep specialist.

How CPAP Works

CPAP stands for continuous positive airway pressure. A bedside machine delivers a steady flow of pressurized air through a hose and mask. That air pressure acts as a splint, keeping the airway from collapsing while you sleep.

Many machines include features to make this easier to live with, such as a heated humidifier to reduce dryness, a ramp mode that builds the pressure up gradually, and automatic start and stop when the mask goes on or comes off.

CPAP advantages

• It is the standard treatment and is widely regarded by sleep specialists as the most effective one, including for moderate and severe obstructive sleep apnea.
• Because it holds the airway open with air pressure, it does not depend on the position of your jaw or the condition of your teeth.
• By treating the apnea, it can also relieve the symptoms that come with it, such as snoring, morning headaches and daytime sleepiness.
• The settings are prescribed for you and can be adjusted by your care team.

CPAP drawbacks

• Some people find the mask uncomfortable, and that is a common reason for not using the machine consistently.
• The machine makes some noise, which bothers some users and bed partners.
• It needs electricity, which complicates travel, camping and power cuts.
• Side effects such as nasal congestion and dryness are common.
• The mask, hose and humidifier need regular cleaning. Some CPAP machines and masks have also been the subject of FDA safety communications and recalls, so register your device and follow the manufacturer's notices.

None of these drawbacks is a reason to stop prescribed CPAP on your own. Mask type, humidity and pressure settings can often be changed to solve the problem, so raise it with your sleep clinic first.

How Oral Appliances Work

An oral appliance for sleep apnea is a custom device made and fitted by a qualified dentist, who works with your physician to decide whether oral appliance therapy suits you. It looks like a sports mouthguard or orthodontic retainer and is worn only during sleep. There are two main kinds:

• Mandibular advancement devices (MADs) hold the lower jaw forward. This enlarges the airway behind the tongue and reduces resistance to airflow. Read more in what is a mandibular advancement device.
• Tongue-retaining or tongue-stabilizing devices (TRDs or TSDs) use gentle suction to hold the tongue forward instead of moving the jaw. They are generally considered less reliable than MADs for obstructive sleep apnea. Read more in what is a tongue-stabilizing device and our TSD vs MAD comparison.

The New York Times has reported that a mouth guard "may be a good alternative" to CPAP for some people with sleep apnea (the article is listed in the references below). The same caution applies there as here: the appliance in question is one prescribed and fitted professionally.

Oral appliance advantages

• Small, silent and needs no electricity, so it travels easily.
• No mask, hose or air pressure, which many people find easier to tolerate.
• People who find a treatment comfortable are more likely to use it every night, and a treatment only helps while it is being used.
• It often reduces snoring as well.

Oral appliance drawbacks

• It may not be as effective as CPAP, particularly in severe sleep apnea.
• It can cause jaw discomfort, tooth tenderness, excess saliva or dry mouth, and over time it can change the way the teeth meet.
• It relies on healthy teeth and gums to hold it in place, so it does not suit everyone.
• It needs regular follow-up with the dentist to adjust the fit and check for side effects, and a follow-up assessment to confirm it is controlling the apnea.
• It does not treat central sleep apnea.

For what the dentist route involves, see our guide to a custom mouthpiece from a dentist.

Oral Appliance vs CPAP: Side by Side

Where Over-the-Counter Snoring Mouthpieces Fit

The mouthpieces we review, such as SnoreRx Plus and VitalSleep, are bought without a prescription and fitted at home. Most are MADs that use the same jaw-forward idea as a dental appliance. They are sold for snoring, not as a treatment for sleep apnea.

That difference is practical, not just a matter of labelling. Nobody examines your teeth and jaw before you use one, nobody sets the jaw position against a sleep study, and nobody checks afterwards whether your breathing has improved. A mouthpiece can quiet the snoring while the pauses in breathing carry on, which can hide a problem that still needs treating. Generic mouth guards bought online are not recommended as a way to treat sleep apnea.

So the sensible uses are narrow and clear:

• You snore and sleep apnea has been ruled out. This is who these devices are made for. Our top-rated option is SnoreRx Plus, an FDA-cleared, boil-and-bite adjustable MAD with a 30-night money-back guarantee.
• You snore and have not been assessed. If you have any of the warning signs listed above, see a doctor before buying anything.
• You have diagnosed sleep apnea. Do not swap prescribed CPAP or a prescribed appliance for an over-the-counter mouthpiece. Ask your doctor about a dentist-fitted appliance if CPAP is not working for you.

Check SnoreRx Plus price →

We cover this question in more depth in can snoring mouthpieces treat sleep apnea, and compare one popular snoring mouthpiece with the machine in ZQuiet vs CPAP. If you are unsure whether a mouthpiece is suitable for you at all, read who should not use a snoring mouthpiece.

How Doctors Choose Between Them

Three things usually drive the decision.

Severity

Sleep apnea is graded by the number of breathing events per hour of sleep recorded in the sleep study:

• Mild: 5 to 15 events per hour.
• Moderate: 15 to 30 events per hour.
• Severe: more than 30 events per hour.

CPAP is highly effective across the range and is the usual recommendation for moderate to severe obstructive sleep apnea. Some people with mild to moderate obstructive sleep apnea may be offered the choice between an oral appliance and CPAP.

What you will actually use

A treatment left in a drawer treats nothing. If you have tried CPAP properly and cannot tolerate it, tell your doctor instead of quietly giving up. An oral appliance you wear every night may serve you better than a machine you avoid, and that is exactly the situation in which oral appliances are commonly prescribed.

Your medical and dental history

Other health conditions, the type of apnea, your weight, and the state of your teeth, gums and jaw joint all affect which option suits you. A dentist needs to confirm that your teeth can support an appliance before one is made.

Getting Started and Staying on Track

1. See your doctor or a sleep specialist and get a diagnosis.
2. Discuss the options that fit your type and severity of sleep apnea, including what happens if the first choice does not suit you.
3. If you choose CPAP, work with the clinic on mask fit and settings in the first weeks, when most problems appear.
4. If you are prescribed an oral appliance, have it made and adjusted by a qualified dentist.
5. Keep the follow-up appointments. Treating sleep apnea is ongoing, and both options need checking to confirm they are still working and to catch new symptoms or side effects.

Frequently Asked Questions

Is a mouthpiece better than a CPAP machine?

Not in general. CPAP is the standard treatment and is usually more effective, particularly for severe sleep apnea. A dentist-fitted oral appliance can be a good option for some people with mild to moderate obstructive sleep apnea, or for those who cannot tolerate CPAP. Your doctor can tell you which applies to you.

Can a mouthpiece replace a CPAP machine?

For some people a prescribed, dentist-fitted oral appliance is used instead of CPAP, but only on a doctor's advice and with follow-up to confirm it is working. An over-the-counter snoring mouthpiece should not replace prescribed CPAP.

Do over-the-counter snoring mouthpieces treat sleep apnea?

No. They are sold to reduce snoring. They are fitted at home without any assessment, and nobody checks whether they control the pauses in breathing. If you suspect sleep apnea, see a doctor first.

Can I use a mouthpiece and a CPAP machine together?

Some clinicians do combine an oral appliance with CPAP for obstructive sleep apnea. It is something to set up with your sleep specialist and dentist, not to try on your own, because the mask fit and pressure settings may need to change.

How often should I replace a sleep apnea mouthpiece?

It depends on the device, the material and how you wear it, including whether you grind your teeth. Your dentist will check the appliance at follow-up visits and tell you when it needs replacing.

I only snore. Do I need a sleep study?

Not everyone who snores has sleep apnea. If your snoring comes with pauses in breathing, gasping, morning headaches or daytime sleepiness, ask your doctor. If those signs are absent and you want to quiet the snoring, an over-the-counter mouthpiece from our best anti-snoring mouthpieces guide is a reasonable thing to try.

References

• Effective Apnea-Hypopnea Index ("Effective AHI"): A New Measure of Effectiveness for Positive Airway Pressure Therapy. https://pubmed.ncbi.nlm.nih.gov/27568799/
• Efficacy versus Effectiveness in the Treatment of Obstructive Sleep Apnea: CPAP and Oral Appliances. https://aadsm.org/docs/JDSM.2.4.175.pdf
• Mouthpiece, CPAP Prove Best for Sleep Apnea https://www.medpagetoday.com/primarycare/sleepdisorders/27971
• For Sleep Apnea, a Mouth Guard May Be a Good Alternative to CPAP https://www.nytimes.com/2021/05/31/well/mind/sleep-apnea-treatment-mouth-guard.html

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