Here is my answer from a previous time this question was asked—still holds true.
My doc told me to take new dish sponges, wet them, stick them in plastic bags and place them in the freezer for use after surgery. I did as I was told because I was 18 at the time. Came home from surgery all doped up and, feeling a bit smug because I am so bright, I put on a hoodie and placed a sponge on each side of my face. It was a “Look, Ma, no hands!” kind of enlightenment. Several hours after my surgery, my mom came home and asked how I was doing. I was still pretty groggy as I had slept all afternoon. She made a really funny face and said, “Something stinks.” I started to cry (I was dazed) and, through the gauze in my mouth, tried to explain that I couldn’t brush me teeth and my mouth tasted as bad as it apparently smelled. I got up from the couch to replace my sponges only to realized that I had thawed a piece of cod on my face all afternoon.