How to Keep Your Teeth and Gums Healthy When Using a CPAP Machine for Sleep Apnea

Treating OSA with a continuous positive airway pressure (CPAP) machine, which delivers pressurized air through a mask to keep your airway open, improves overall sleep and overall health, but the therapy comes with oral health risks of its own.

There can be side effects or issues that can leave your teeth and gums more vulnerable to cavities, gum inflammation, and bad breath, says Elham Abbassi, DDS, a clinical associate professor in the department of general practice and dental public health at the University of Texas Health Science Center at the Houston School of Dentistry.

The good news: CPAP itself is not inherently harmful to oral health, says Dr. Abbassi. With good oral health habits, a few simple adjustments to your CPAP setup, and regular check-ins with your dentist, you can keep your mouth healthy.

Dry Mouth Caused by CPAP: More Than an Annoyance

Dry mouth happens because the steady flow of air from your machine can evaporate saliva, especially if your mouth falls open during sleep or your mask leaks, says Abbassi.

“Saliva is one of the most important natural defense systems in the oral environment; it does much more than simply keep the mouth moist,” she says.

Abbassi explains the different ways that saliva protects your teeth and gums.

Neutralizes Acids Saliva contains natural buffers that counteract the acids bacteria produce after you eat, which keeps your mouth from staying acidic enough to pull minerals out of your enamel.

Washes Away Debris Normal saliva flow rinses food particles, sugars, acids, and germs off your teeth.

Repairs Early Enamel Damage Saliva supplies calcium, phosphate, and other minerals that help repair early, microscopic mineral loss in enamel before it turns into a cavity.

When CPAP contributes to dry mouth, often because of mouth breathing or air leakage, those protective functions are reduced, says Abbassi. “The issue is not simply that the mouth feels dry; the oral environment itself becomes less protective,” she says.

With less saliva, acids are neutralized less effectively, and food and plaque (the sticky film of bacteria that coats your teeth) are cleared away less efficiently, which can raise your risk of cavities, she says.

“Dry tissues are also more prone to irritation and inflammation, which may contribute to gum problems and bad breath,” adds Abbassi.

Common Dental Issues Associated With CPAP Use

“CPAP does not automatically cause cavities or gum disease; many patients use CPAP for years without significant dental problems,” says Abbassi.

The people most at risk for dental issues are typically those who wake up with a very dry mouth every morning, have substantial mask leakage or mouth breathing, and already have other risk factors for dental disease, she says.

Here are some common dental issues.

Gum Inflammation Dry mouth can contribute to gingivitis, an early form of gum disease marked by irritated, inflamed gums, says Abbassi. In people who already have gum disease or are prone to cavities, persistent dry mouth can make those conditions harder to control, she says.

Bite Changes and Tooth Movement Changes in how your upper and lower teeth fit together, known as occlusal changes, are less common than dry mouth problems, but they can happen, she says.

“Over time, a CPAP mask can apply low but continuous pressure to the teeth, lips, and facial structures,” says Abbassi. “Because patients may wear the device six to eight hours every night for years, even relatively small forces can potentially produce gradual dental or occlusal changes,” she says.

You’re unlikely to notice a dramatic change overnight, says Abbassi. “Instead, they may say things like, ‘My bite doesn’t feel the same,’ ‘My front teeth don’t meet the way they used to,’ or ‘My teeth seem to have shifted.’”

Daily Habits to Protect Your Oral Health

There are everyday habits and CPAP adjustments that can help protect your teeth and gums. Abbassi recommends the following.

Optimize your CPAP setup. Your sleep team can check for mask leaks, review your humidifier settings, look into nasal symptoms, and decide whether a different style of mask would work better, she says. Abbassi cautions against changing your pressure settings or stopping CPAP because of an oral problem; the point is to manage oral side effects while keeping your sleep apnea effectively treated.

Level up your oral hygiene routine. “For someone using CPAP, I recommend a very consistent nighttime oral hygiene routine, especially if they experience dry mouth,” says Abbassi. The goal is to remove as much plaque and food debris as possible before salivary flow naturally decreases during sleep, she says.

Her suggested routine includes:

Brush for two minutes. Use fluoride toothpaste and brush thoroughly in the morning and before bed.

Clean between your teeth. Use floss or another tool made for cleaning between teeth.

Keep your CPAP gear clean. “CPAP equipment should be cleaned regularly, because it is exposed every night to moisture, skin oils, saliva, respiratory secretions, and microorganisms,” she says.

A dirty mask cushion can irritate your skin and interfere with the seal, causing air leaks that can worsen dry mouth, says Abbassi. Follow the manufacturer’s cleaning instructions, too, since recommendations vary by device, she says.

How Your Dentist Can Help

“A dentist can play an important role in the ongoing care of a patient who uses CPAP, because we may be the first to recognize some of its oral side effects,” says Abbassi.

Here’s how, she says.

Early Detection At routine exams, dentists can spot dry mouth, a higher risk of cavities, gum inflammation, and changes in your tooth position or bite, and can help figure out what’s behind the dryness.

“Medications and other medical conditions can also contribute to dry mouth, so we don’t want to automatically assume CPAP is the only cause,” she says.

Preventive Treatment If you’re at higher risk for cavities, your dentist may recommend extra fluoride, such as a prescription-strength fluoride toothpaste or rinse.

Bite Monitoring and Custom Night Guards Dentists can keep an eye on how your teeth fit together and whether they’ve shifted. “If a change is detected, it doesn’t mean the patient should stop CPAP,” says Abbassi.

Work With Your Sleep Team “The dentist identifies and manages the oral consequences, while the sleep team helps optimize CPAP therapy so the patient can continue receiving effective treatment with fewer side effects,” Abbassi says.

CPAP alone doesn’t necessarily mean you need more frequent dental visits, says Abbassi. If your oral health is good and you don’t have significant dry mouth, you may be fine with the schedule your dentist recommends, often every six months, she says.

Persistent dry mouth, recurrent cavities, or gum disease may call for visits every three to four months, depending on your risk, says Abbassi.