First of all, WELL DONE for choosing the BEST for your baby, so few do these days! I've breastfed all four of mine and have just weaned my youngest off at 16 months old. I have been bitten numerous times! NOT NICE! I would yelp/scream in an exagerated way to let them know they had hurt me, then quickly detach(by pushing your little finger into the corner of the mouth) and say "NO BITING" in a stern voice! It has always worked for me although there may still be the odd ocasion now and then, just use the same technique. She is just testing out her chompers
I wish you the best of luck!