Oral appliance vs. CPAP: which one should you use?

The short answer

CPAP (continuous positive airway pressure) is the standard treatment for severe obstructive sleep apnea, and a custom oral appliance is a recognized treatment for mild to moderate apnea, and for people who cannot tolerate CPAP. Neither one is "better" in the abstract. The better one is the one that keeps your airway open and that you will wear every single night.

One thing has to come first either way: a sleep study read by a sleep physician. Apnea is a medical diagnosis. I can screen for it, and I make the appliance, but the diagnosis and the prescription belong to medicine.

What is actually happening at night

When you fall asleep, the muscles of your throat relax. In obstructive sleep apnea, the back of the throat collapses, the tongue falls back, and the airway closes off. Oxygen drops, your heart races, and your brain jolts you just far enough awake to breathe again.

Then it repeats, sometimes hundreds of times a night. You may not remember any of it. Your bed partner often hears it, because snoring is the sound of an airway that is partly blocked.

Both treatments exist to stop that collapse. They just do it from different directions.

How each one works

CPAP is a bedside machine that blows a steady stream of air through a mask, holding the airway open with pressure from the inside. It treats every level of apnea, including severe, and it is what a sleep physician will usually reach for first when the numbers are high.

An oral appliance is a custom-fitted device, similar to a retainer, made from impressions of your teeth. It holds your lower jaw slightly forward while you sleep. The tongue comes forward with the jaw, and the airway stays open without a machine, a mask, or a hose. It is a physical fix for a physical collapse.

A night guard is not an oral appliance for apnea. A night guard protects your teeth from grinding. It does not move the jaw and it does not open the airway. I have described it to patients as a bandaid, a very stiff, hard bandaid, on the teeth, while the reason you grind goes untreated.

The honest trade-offs

Here is the comparison the way I would give it to a friend:

• CPAP is the stronger treatment on paper. It moves more air, it works for severe apnea, and its results are easy for your physician to track. The catch is the mask, the hose, the noise, and the travel case. In my experience, a lot of people prescribed CPAP quietly stop using it.
• An oral appliance is quiet, small, and fits in a shirt pocket. Most people adapt to it quickly. The catch: it is built for mild to moderate apnea, and it can cause jaw or tooth soreness at first. Over years of nightly wear it can also shift how your teeth meet, which is why I check your bite at every follow-up.
• The result that matters is measured on you, not on the box. A CPAP you stop using does not treat your apnea. An appliance you wear every night does.

The treatment that works is the one you will use.

When CPAP is the right call

If your sleep study shows severe obstructive sleep apnea, start with CPAP and give it a real try. Your physician can adjust the pressure and the mask style, and many people who hated it at first settle in once the fit is right. If you have significant heart or lung conditions alongside the apnea, your physician may want the stronger treatment regardless of how mild the number looks. I will not talk you out of a CPAP that is working.

When an oral appliance fits

• Your sleep study shows mild to moderate obstructive sleep apnea.
• You have severe apnea, you have honestly tried CPAP, and you cannot tolerate it.
• You travel often, or you sleep somewhere a machine is not practical.
• You already use CPAP and your physician suggests adding an appliance, which some sleep physicians do to make the mask easier to live with.

In every one of these cases, the appliance is prescribed by your sleep physician and made by a dentist. We work as a team, and I send your physician the follow-up notes so the treatment is checked against your sleep, not just against how the device feels.

Why I ask about sleep

For years I was the dentist who saw worn, cracked teeth and a scalloped tongue, the wavy edge a tongue gets from pressing against the teeth all night, and did not ask the next question, because I did not know what to do with the answer. I do now.

I see most of my patients more often than their physician does, so a dental chair is a good place to catch the signs: loud snoring, morning headaches, waking up tired after a full night, a partner who has watched you stop breathing. I am not the end of the road on sleep apnea. I am part of the journey, and my job is to notice, to refer, and, when the physician agrees, to build the appliance well.

How to get started

1. Get a diagnosis If you have not had a sleep study, we screen you at a regular visit and help you get one arranged through your physician or a sleep clinic.
2. Bring the results With the diagnosis and your physician's prescription in hand, we take impressions and build an appliance to your exact bite.
3. Fit, adjust, and check We fine-tune the fit over the first weeks, teach you a short morning exercise for your jaw, and check in with your sleep physician on how the treatment is working.