Well from what I've heard, mice teeth are usually harmless and not strong enough to puncture skin or leave marks (unless you leave them in there for a long time of course). Rats on the other hand may be a different story.

If you are worried about your BP being harmed, just have something long laying around, maybe a hemostat (I use a chopstick) and when the strike occurs, a bad one at that, and you notice the prey's mouth/head is free and in defense mode, you can use your tool to aid the mouse into biting the object rather than the snakes skin. Don't be afraid of rolling the snake over to expose the mouse's free head because the snake would be in a trance and won't even notice it.

I've been feeding live and have encountered no problems. Do take seriously Joanna's thoughts as they are very true. It is nature's way and we are just there to aid them, not by regulating how they feed, but to make sure they do feed in a way that is most beneficial to them.