Just thought I would copy and paste from the other thread to make it easier to read.

# With an older baby, the weight of the baby can cause baby's mouth and teeth to "drag down" on the breast tissue. See if you can position baby so that her weight is supported well. Use pillows or a chair with arm rests to support her as much as you can. When she is nursing on the left side, bring her bottom in a little bit closer and vice versa. Don't let her nurse in a position that lets her weight and gravity cause her mouth to pull down on your breast and nipple. Try moving her body slightly in different ways (higher, lower, side to side, etc.) till the pressure on your breast is lessened.
# Latch baby on and position her head so that it is tilted back more to get the pressure of the top teeth off your breast. For example, if baby is nursing in the cradle position on the left side, bring her body toward the right a bit. This will bring baby's chin up, with her head a bit ****ed back, and that moves the pressure of baby's top teeth off the top of the nipple. Don't let her chin rest on her chest.
# Some other ways to get baby's head tilted back more: ask your child to look at you while she nurses, or hold a book up high to read to your child and have her look at the book.
# When you support your breast with 2-4 fingers underneath and thumb on top, push in against the chest wall with your index finger just before offering the breast. This will cause the nipple and areola to point down more, so that they don't rub against baby's upper teeth. This technique is often suggested for moms who have nipple soreness due to their nipples rubbing up against the roof of baby's mouth.
# Ask baby to open WIDE and show her with your own mouth. Tell her that it hurts mommy and ask her to try again until it feels better.