Do I suck if I say "Absolutely nothing"?
But...infected tooth came pretty close. To me, it isn't really terrible pain unless you literally cannot sleep through it for more than a couple of minutes, even when totally exhausted. That was labor for me, and the infected tooth was like that too.
I had a sinus infection about a year ago that was so bad I was throwing up, dizzy and begging for a "head epidural." That was pretty bad, too.
I had my wisdom teeth out with only Novocaine, and I've had complex oral surgery and a root canal, also with only Novocaine. Enh. Broken bone: enh. Burns, though. Burns hurt me a lot. I can definitely imagine a burn hurting worse than childbirth.
I keep hearing about the afterpain thing. I barely even remember them--the only impression they made was, "Hmm...so this is what it's like to feel a contraction in my uterus!" (I had back labor.). I've heard they're much worse with second and subsequent children, though. True?