He needs to put a civil tongue in his mouth.

It is important to keep a civil tongue in one's mouth.

all of one's taste is in one's mouth

All one's taste is in one's mouth.

I will take the bread out of his mouth.

She always laughs on the wrong side of her mouth when she's nervous.

You kiss your grandmother with that mouth.

You kiss your girlfriend with that mouth.

He was speaking out of both sides of his mouth during the meeting.

I always stick my foot in my mouth when I try to make a joke.