As you noted, my mouth never tastes bad in the morning, so why should I?

But even so, my mouth tasted of something like ashes.

What he had done seemed to be the safest course, though his mouth tasted bad from it.

Your mouth, however, will taste as though something crawled in there and died.

It was hot in the street, and his mouth tasted like old copper.

Her mouth tasted like old features taken off a tar road.

When I woke up the next morning, my mouth tasted good.

My mouth tasted like old filter screen, and just about as dry.

Other people's mouths taste strange at first, but you'll get used to them.

His mouth tasted like several small animals had been using it as a rest room.