Does getting an anesthesia shot in your mouth hurt?

Actually, not at all, depending on how you handle it. Mind over matter.

But typically, the injection itself feels like a toothpick poking your skin, and it really doesn't hurt. Just a quick pinch.

The next day or two, you may have a small headache and some stiffness in your arm, but as along as you ease it, it shouldn't be a problem.