Quick Answer: The best CPAP mask depends on how you breathe and how you sleep. Nasal pillow masks suit side and stomach sleepers who breathe through their nose. Full-face masks work for mouth breathers and high-pressure prescriptions. Nasal cushion masks split the difference. Most fit problems come from overtightening, not undertightening.
In This Guide
Reading Time: 9 minutes
If you have been prescribed CPAP therapy and your mask is uncomfortable, leaking, or keeping you awake, you are not alone. Research published in Sleep Medicine found that between 29% and 83% of CPAP patients are non-adherent, with the most common reasons being discomfort, leaks, and poor fit (Weaver & Grunstein, PMC2645251). The machine is doing its job. The mask may not be.
This guide is not about picking a specific product. It is about understanding what each mask type does well, which positions it suits, and how to troubleshoot the most common problems. A mattress and sleep environment that works with your CPAP setup, rather than against it, matters too, and we will get to that.
Sleep Apnea in Canada: The Underdiagnosis Gap
What the Research Shows
A 2024 analysis of the Canadian Longitudinal Study on Aging (n=51,337, ages 45-85) found that 28.1% of Canadians in that age group have moderate-to-severe obstructive sleep apnea. Only 1.1% have a clinical diagnosis. That means roughly 92.9% of high-risk individuals have not been identified (PMC11644135).
Statistics Canada (2016-2017) reported that 6.4% of all Canadian adults self-report a sleep apnea diagnosis, more than double the 3% rate from 2009. Among adults 60-79, that figure rises to 12.8%.
If you have already been diagnosed and prescribed CPAP, you are in the minority who caught it. The challenge now is making the therapy work consistently.
Ontario residents with a diagnosis can access CPAP funding through the Assistive Devices Program (ADP), which covers a portion of equipment costs. A respiratory therapist (RT) referral is typically the path to a proper mask fitting and pressure titration. The mask type your RT recommends at titration is a starting point, not a permanent assignment. Many patients switch mask types in the first 90 days.
The Four CPAP Mask Types Compared
| Mask Type | Coverage | Best Pressure Range | Best For | Avoid If |
|---|---|---|---|---|
| Nasal Pillow | Inserts at nostrils only | Under 12-14 cm H2O | Side/stomach sleepers, facial hair, claustrophobia | Mouth breathers, high-pressure prescription |
| Nasal Cushion | Nose bridge to upper lip | 6-16 cm H2O | Most sleepers, moderate pressure, nose breathers | Chronic mouth breathers, very high pressure |
| Full-Face (Oronasal) | Nose and mouth | High pressure best; handles all | Mouth breathers, nasal congestion, high-pressure settings | Active side/stomach sleepers; aerophagia-prone users |
| Hybrid | Nasal pillows + oral cushion | Moderate to high | Mouth breathers who dislike nasal bridge pressure | Stomach sleepers; precise fit is critical |
Nasal Pillow Masks
Nasal pillows insert directly at or into the nostrils, covering roughly two square inches of contact area. They are the lowest-profile option and the most comfortable for side sleepers because they do not extend across the cheeks. The tube often exits at the top of the head (AirFit P30i design), keeping it away from the pillow entirely.
The limitation is pressure: above roughly 12-14 cm H2O, the small seal area struggles to maintain integrity without blowing out. Patients with higher prescriptions generally cannot use nasal pillows effectively.
Nasal Cushion Masks
The nasal cushion is the most-used mask type globally. It covers from the nose bridge down to just above the upper lip, sealing around the entire nose. It handles a wide pressure range and suits most sleep positions. A 2018 randomised controlled trial comparing mask interfaces found that nasal masks produced a lower residual apnea-hypopnea index (4.0 vs. 7.1 events per hour) and greater patient preference compared to full-face masks (PMC5734878).
The catch: mouth breathing defeats a nasal-only seal. If you wake with a dry mouth using a nasal mask, your mouth is opening during the night and the therapy is being partially bypassed.
Full-Face (Oronasal) Masks
Full-face masks cover both the nose and mouth. They are the go-to for mouth breathers and for patients with prescriptions above 15 cm H2O. However, research consistently shows they require higher pressures than nasal masks to achieve the same therapeutic result. A 2016 study found full-face users needed a median 12 cm H2O versus 10 cm H2O for nasal users, and were 4.5 times more likely to need pressures above 15 cm H2O (PMC4990949).
Full-face masks also increase aerophagia (air swallowing), which causes bloating and burping and is more common when sleeping supine with this mask type.
Hybrid Masks
Hybrid masks combine nasal pillows with an oral cushion, covering mouth breathing without the large nasal bridge contact of a classic full-face. The ResMed AirFit F30 is the market standard. They suit mouth breathers who find full-face masks claustrophobic or skin-irritating. The fit precision is more critical with hybrids, however, and they are harder to troubleshoot remotely.
Matching Your Mask to Your Sleep Position
Position-to-Mask Compatibility
- Side sleepers: Nasal pillow is first choice (low profile, minimal face contact). Nasal cushion works with a CPAP-cut pillow. Full-face is awkward against a standard pillow and prone to shifting.
- Back sleepers: Any mask type is viable. Full-face is most stable for pure back sleepers, though aerophagia risk is highest in this position.
- Stomach sleepers: Nasal pillow with top-of-head tubing routing is the only realistic option. All other mask types press uncomfortably into the pillow.
- Combination sleepers (shifting positions): Choose nasal pillow or nasal cushion with a swivel elbow connector and consider top-of-head tubing to avoid tube entanglement during rolls.
The mattress surface matters here. Side sleepers who use CPAP need a mattress with enough pressure relief at the shoulder that they are not rising up and disrupting the mask seal during the night. Many of our customers at the showroom come in specifically because their CPAP is working well but their mattress is causing them to shift constantly, which breaks the mask contact. Dorothy, our sleep specialist, often asks CPAP users about their mask type before making a firmness recommendation, because a mask that requires minimal face contact (nasal pillow) tolerates a firmer surface better than one that relies on consistent side-of-face contact.
Dorothy, Sleep Specialist: "When a customer mentions CPAP, I ask what type of mask they use and which way they sleep. A side sleeper with a full-face mask needs a mattress that sinks enough at the shoulder that their face angle is not fighting the mask. It changes the recommendation significantly."
Common Problems and How to Fix Them
Troubleshooting Common CPAP Mask Issues
A 2021 real-world study of 1,484 CPAP patients found that 75.4% reported leaks, 70.6% reported dry mouth, and 31.9% reported mask pain (PMC7809735). These are not rare edge cases. They are the norm.
- Leaks: Usually caused by overtightening (which distorts the silicone and creates gaps), wrong size, or a worn cushion. Replace cushions monthly. Use the manufacturer sizing template. One finger should slide under each strap.
- Dry mouth: Indicates mouth breathing. Add or increase the heated humidifier setting. Consider a chin strap with a nasal-only mask, or switch to a full-face or hybrid. PMC7809735 found dry mouth independently associated with worse adherence.
- Pressure marks and skin irritation: The mask is too tight or the wrong size. Try mask liners (thin fabric layer between silicone and skin). Memory foam cushion variants (ResMed AirTouch series) dramatically reduce pressure marks for some users.
- Claustrophobia: Switch to nasal pillow (smallest footprint). Try desensitisation: wear the mask while awake watching television before using it with airflow. Use the CPAP ramp feature to start at low pressure.
- Aerophagia (bloating, burping from swallowed air): More common with full-face masks and high fixed pressures. Switching to nasal mask and requesting auto-CPAP titration reduces median treatment pressure by roughly 4 cm H2O and significantly reduces aerophagia symptoms (PMC5482575).
- Noise: Leak at the exhalation port or cushion seal. Check the cushion condition first. Noise that persists after replacing the cushion usually means the headgear is stretched and no longer holding the mask in place.
Practical Fitting Guide
Sizing
Mask sizes are not standardised across brands. A ResMed "small" does not correspond to a Philips Respironics "small." Use the manufacturer's sizing template, which typically involves measuring nasal width and bridge-to-lip distance. These templates come in the mask box. If you were fitted by an RT, ask for the specific measurements they used.
The Seal Test
Before tightening the headgear: turn the machine on, hold the mask against your face without straps, and feel for air escaping. This tells you whether the mask geometry is compatible with your face shape before you ever involve the headgear. Then add the headgear with minimal tension and check again. Finally, lie in your actual sleep position and recheck. A mask that seals well upright but leaks on your side needs either a different mask type or a CPAP-specific pillow with cutouts.
Strap Adjustment
Overtightening is the most common fitting mistake. Tighten until the seal is achieved, then stop. You should be able to slide one finger under each strap. Pressure marks that persist more than 30 minutes after removal mean the mask was too tight. Adjust symmetrically, starting with the top straps before the bottom.
Maintenance
Replace silicone cushions every 30 days. Skin oils and residue degrade the silicone surface and reduce its natural tackiness, causing progressive seal failure that is easy to miss because it happens gradually. Headgear elastic loses tension at 3-6 months. Wash the cushion with mild soap daily.
When to See a Sleep Specialist
If you have tried two mask types over 90 days and still have significant leaks, residual AHI above 5 events per hour on your device's data, or are averaging under four hours per night of use, request a follow-up with your respiratory therapist or a sleep physician. Auto-CPAP (APAP) titration, which adjusts pressure dynamically throughout the night rather than holding a fixed pressure, reduces mean treatment pressure and improves tolerance for many patients who struggle with fixed-pressure machines.
Ontario residents can access polysomnography referrals through a family physician. Wait times vary, but many private sleep clinics in Hamilton, Kitchener, and Brantford itself offer faster turnaround for diagnostic studies. The Ontario Telemedicine Network also connects patients in smaller communities to sleep medicine physicians without requiring travel.
A Note on Local Resources
Brantford General Hospital has a sleep lab, and the Greater Hamilton Health Network includes sleep medicine services accessible to Brantford residents. If your GP is hesitant to refer, the Canadian Sleep Society (CSS) patient resources at canadiansleepsociety.ca include a physician finder and a guide to navigating the referral process.
For CPAP equipment, Brantford has several respiratory therapy providers in the West Street corridor. Your ADP coverage requires a qualifying device, so confirm your RT can process the paperwork at the point of purchase.
Frequently Asked Questions
Can I switch CPAP mask types without a new prescription?
The mask is separate from the pressure prescription. You do not need a new prescription to try a different mask type. If switching from nasal to full-face, however, your prescribed pressure may need adjustment, full-face masks require higher pressures to achieve the same therapeutic result (PMC4990949). Discuss with your RT before switching mask types if your current pressure is at or above 12 cm H2O.
My CPAP mask leaks no matter how tight I make it. What am I doing wrong?
Overtightening is usually the problem, not undertightening. Tightening beyond the seal point distorts the silicone cushion and actually creates more gaps. Loosen the straps so one finger slides under each, perform the seal test, and do not increase tension past the point of initial seal. If leaks persist with correct tension, the cushion needs replacing or the mask size is wrong.
Is a full-face mask better for mouth breathers?
A full-face mask prevents therapy loss when you mouth-breathe, but it is not always the best solution. A nasal mask paired with a chin strap can be equally effective and produces lower residual AHI for many patients (PMC5734878). Full-face masks also worsen aerophagia. Try nasal with chin strap first before assuming full-face is necessary.
Does Ontario OHIP cover CPAP masks or equipment?
OHIP does not cover CPAP machines or masks directly. The Assistive Devices Program (ADP) covers 75% of the purchase price of a CPAP device for eligible patients (confirmed OSA diagnosis, physician application). Masks, tubing, and filters are considered consumables and are not covered by ADP, though many extended health benefit plans cover these with a respiratory therapy prescription. Check your plan under "respiratory therapy supplies."
Can the type of mattress I use affect my CPAP therapy?
Indirectly, yes. Side sleepers using CPAP need sufficient shoulder pressure relief so they do not shift positions frequently during the night, which breaks the mask seal and generates leak events. A mattress that is too firm for a side sleeper creates pressure on the shoulder, causing unconscious repositioning. Consistent sleep position is one of the factors that keeps mask contact stable through the night.
Related Reading
- Best Mattress for Sleep Apnea
- Best Pillow for Side Sleepers
- Bruxism Treatment and Sleep Quality
- Best White Noise Apps for Sleep
- Best Mattress for Side Sleepers
Visit Our Brantford Showroom
We are located at 441½ West Street in downtown Brantford. Free parking available, wheelchair accessible. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle, 441½ West Street, Brantford, ON, (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.
If you use CPAP therapy and are waking up with shoulder pain or shifting through the night, it may be the mattress surface, not the therapy, that needs attention. Call Talia at (519) 770-0001 to talk through your sleep position and we will point you in the right direction. Outside store hours? Our chat box is available almost any time we are not sleeping.
Sources
- Weaver TE, Grunstein RR. "Adherence to Continuous Positive Airway Pressure Therapy." Proc Am Thorac Soc. 2008. PMC2645251 (PMID 18250209)
- Andrade RGS et al. "Comparing the Efficacy, Mask Leak, Patient Adherence, and Patient Preference of Three Different CPAP Interfaces." J Clin Sleep Med. 2018. PMC5734878 (PMID 29198305)
- Ng SS et al. "Oronasal Masks Require a Higher Pressure than Nasal and Nasal Pillow Masks." Respirology. 2016. PMC4990949 (PMID 27448430)
- Lebret M et al. "Mask side-effects in long-term CPAP-patients impact adherence and sleepiness: the InterfaceVent real-life study." ERJ Open Res. 2021. PMC7809735 (PMID 33451313)
- Desai H et al. "Aerophagia During CPAP for OSA: The Case for Auto-CPAP and Nasal Mask." J Clin Sleep Med. 2017. PMC5482575 (PMID 28633717)
- Jehan S et al. "Prevalence and regional distribution of obstructive sleep apnea in Canada: Analysis from the Canadian Longitudinal Study on Aging." J Sleep Med. 2024. PMC11644135 (PMID 39037568)
- Statistics Canada. "Sleep apnea in Canada, 2016 and 2017." Catalogue 82-625-X. 2018.