Use a breathing barrier (referred to as a mask).
Breathing is required for CPR. You can use a breathing barrier such as a mask; or use a bag valve mask for the breaths. Mouth to mouth, per se, is not recommended.
It depends on the type of mask you're wearing, but a mask should be worn covering both your nose and mouth.
You may have to use a "full face" mask (one that covers your mouth and nose). Your sleep therapist or doctor should be able to confirm this.
Use a CPR mask which comes with a disposable 1-way valve to discard after each use.
sitting mouth closed and teeth lightly touching
To place a protective mask on your face, start by washing your hands thoroughly with soap and water. Hold the mask by the ear loops or ties, and bring it to your nose level. Place the mask over your nose, mouth, and chin, ensuring a snug fit. Adjust the mask if needed and avoid touching it while wearing.
bag-valve mask, mouth to mouth (pocket face mask), automated ventilator.
NINTENDO MAGIC! That is all.
If you mean the surgical mask... it's a surgical mask.
a mask and eye shield
Use unsharp mask to sharpen picture and bring more details to an image.