Your mask type

Oral mask

An oral mask delivers air only through the mouth, using a mouthpiece that sits between the lips and teeth with an outer flap that seals over the lips. It is rarely used today; the best known example, the Fisher and Paykel Oracle 452, has been discontinued.

How it works

A soft mouthpiece sits inside your lips and an outer cover sits outside them, holding the lips between the two to form the seal. Air enters and leaves through the mouth, so the nose must stay closed (nose plugs are sometimes used) or air escapes.

Because air bypasses the nose, it skips the natural warming and humidifying the nose provides. Retailer information for the Oracle 452 said it should be used only with a heated humidifier.

Usually suits

  • People with severe, fixed nasal blockage who cannot use any nasal or full face mask, as advised by their clinician
  • People who could not tolerate any other interface after several fittings

Often a poor fit for

  • Almost everyone starting CPAP, since nasal and full face masks are the standard options
  • People without a heated humidifier
  • People with dental, jaw or lip problems that make a mouthpiece uncomfortable
  • Anyone who breathes through the nose during sleep

Pressure and this mask type

Pressure delivered only through the mouth does not splint the airway the same way nasal pressure does: an American Thoracic Society workshop described how oral pressure can narrow the upper airway and push the jaw back. Using an oral mask is a decision for your sleep clinician, who may need to review your settings and data.

Common problems and fixes

Severe dry mouth

Use heated humidification, which oral mask makers have required. Dryness that continues should go back to your provider.

Air leaking out of the nose

The nose is an open path for air. Ask your provider about nose plugs or a different interface.

Sore lips, gums or jaw

Stop and contact your provider. A mouthpiece that hurts is a fitting problem, and dental issues need a dentist.

Frequently asked questions

Are oral CPAP masks still sold?

Very few are. The Fisher and Paykel Oracle 452, the main oral mask in recent years, has been discontinued, and retailer stock of parts is limited. Ask your equipment provider what is available if your clinician recommends one.

Is an oral mask better than a full face mask for mouth breathers?

Usually not. Full face and under the nose full face masks are the standard choice for mouth breathers, and oral masks are generally treated as a last resort.

Do I need a humidifier with an oral mask?

Yes. Because air skips the nose, it is dry and cool when it reaches your mouth, and oral mask makers recommended heated humidification.

Sources

Last reviewed October 11, 2026. How we research · Report an error