Keep your MOUTH SHUT when your shoveling the snow. DON'T SAY NO ONE WARNED YOU ...
So I knew this guy on the bus from my area. He was shoveling snow for money had been out a long time.
He got a cracked tooth from the cold. Dentist told him: yes if you leave your mouth open and it's really cold it will cause a tooth crack. Common knowlege further north.
very painful you don't want a cold crack in your tooth, from what i hear, it's all bad