I wouldn't POUR Listerine into a snake's mouth. The risk of them getting it into their lungs is far too great. Can't imagine that swallowing it would be good for them either. If you're going to use it, it should be in a squirt bottle and simply misted at their face. Even that, I would save for something more intimidating and damaging than a simple ball python.
Best thing to do if there's a feeding error with a ball python is to simple sit still and stay calm. It may take a few minutes, but the snake will realize it made a mistake and let go. But the more you wriggle, squirm, and try to pry it off, the more it's going to continue to try and "kill" you.
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