Can Mouth Guards Worsen Sleep Apnea?

Let’s be honest about how you probably ended up with that mouth guard.

You mentioned the clenching, or the jaw pain, or the fact that you wake up feeling like you got hit by a truck. Someone said, “Let’s try a guard.” You paid for it. You wore it like a good patient.

And your sleep didn’t get better. Maybe it got worse.

Back when I practiced dental hygiene, I heard this constantly — people convinced their sleep tanked after the guard showed up. They weren’t imagining it. Guards get sold all the time to solve a problem the provider couldn’t quite name. Sometimes they help the teeth. That doesn’t mean they’re helping your sleep.

So let’s answer the real question.

Can mouth guards worsen sleep apnea?

Here’s the part nobody explains: “mouth guard” means a few very different things, and they do opposite things to your airway.

A flat night guard (occlusal guard). This is the one most people have. It’s made to protect your teeth from grinding. It does not treat sleep apnea — and for some people, it can make it worse, because of how it shifts the bite and jaw while you sleep. If you have apnea and you’re wearing one of these hoping it helps your breathing, it’s worth pausing on.

A mandibular advancement device (MAD). Different tool entirely. It moves your lower jaw forward, which can open the airway and help some people with milder apnea. It’s a real option — but it comes with its own trade-offs over time, and it still doesn’t touch why your airway is collapsing in the first place.

The common thread: none of these get to the root cause. They manage a symptom while the actual driver — how your airway, tongue, and breathing function — goes unaddressed.

Who should think twice about a mouth guard?

I can’t tell you what’s right for your specific mouth — that’s what an evaluation is for. But this is worth flagging:

If you have sleep apnea, or you suspect you do, a flat night guard meant for grinding is not treating that. In some people it can make the airway more likely to collapse, not less. That’s not a reason to panic and rip it out tonight — it’s a reason to actually find out what’s driving your sleep, instead of layering a guard on top of a question nobody’s answered.

If you’re exhausted no matter how long you’re in bed, if your mouth falls open at night, if you snore, if you wake up unrefreshed — the guard was never going to fix that. Those are airway and breathing signals.

What should you do if you already have a mouth guard?

Three honest steps:

1. Don’t assume it’s fixing your sleep. If your tiredness hasn’t budged, believe your body over the receipt.
2. Get the root cause looked at. The question isn’t “guard or no guard” — it’s “what is actually making my sleep this bad, and can it be improved?”
3. Find out whether your airway and breathing can be retrained. For a lot of people, they can.

That last part is where myofunctional therapy comes in.

How myofunctional therapy addresses the root cause

Myofunctional therapy is a guided program of exercises that retrains the muscles of your mouth, tongue, and airway to support better breathing — and better sleep. It’s not a gadget you wear and hope. It’s you, learning to breathe and rest your tongue and airway the way they’re supposed to work.

It’s one of the most under-mentioned tools in mainstream sleep care — most people with apnea are never told it exists. It won’t be the answer for everyone, and it isn’t magic. But for a lot of tired humans who’ve only ever been offered a guard or a CPAP, it’s the first thing that actually looks at why.

Ready for a straight answer about your sleep?

If you suspect or have sleep apnea and you’re tired of managing symptoms with gear that isn’t working, the next step is simple: book an exam.

Frequently Asked Questions

Can a mouth guards worsen sleep apnea?

A flat night guard doesn’t usually cause sleep apnea on its own, but for some people it can make existing apnea worse by changing how the jaw and bite sit during sleep. It’s made to protect teeth from grinding — not to treat breathing.

What’s the difference between a night guard and a sleep apnea device?

A night/occlusal guard protects your teeth from grinding and isn’t a treatment for apnea. A mandibular advancement device (MAD) moves the lower jaw forward to open the airway and can help some people with milder apnea. Neither addresses the underlying cause of why the airway collapses.

Should I stop wearing my mouth guard?

That’s a question for an evaluation, not a website — it depends on why you were given it and what’s happening with your sleep. What’s worth doing is finding out what’s actually driving your tiredness instead of assuming the guard has it covered.

Can myofunctional therapy help sleep apnea?

For some people, yes. It retrains the muscles of the mouth, tongue, and airway to support better breathing and sleep. It won’t be the full answer for everyone, and results depend on what’s driving the problem — which is exactly what the exam is for.

How do I start myofunctional therapy?

Book a 60-minute virtual exam. You’ll get a clear picture of your airway and oral function and a report on what to do next.