My little one now has top chompers and he doesn't bite so much as really draw back when he's nursing and grips with his top teeth. I'm now getting these little cuts in the top of the nipple that hurt like hell--so much so a couple of nights I had to say enough and let dad get him back to sleep (which is what we need to be doing now anyway, but that's a different story).

Does this pass? Do your nipples go through another round of toughening up when the teeth are fully in? Do they learn not to grip so much?