boo has her two bottom front (sharp) teeth and during week 29 i received my first bite. there is a common misconception that once a baby has teeth, breastfeeding is uncomfortable or even impossible. in reality, if your baby is nursing properly, then you should not feel her teeth. It's physically impossible for baby to nurse and bite at the same time, because her tongue covers the bottom teeth when baby is nursing. boo had just finished eating when she bit me.
kellymom has a great page on "When Baby Bites" which includes suggestions on what to do if and when biting becomes an issue.
when boo bit me i was more startled then physically hurt. two small teeth biting down on my nipple is not a pleasant sensation, especially during a late night feeding when i'm only half-awake! i involuntarily reacted by using my finger to break boo's latch and firmly(without yelling) said "no". this reaction was pure instinct and luckily, effective. the Nursing Mothers Companion warns that a strong negative reaction to biting, such as yelling out, could lead to a nursing strike or worse, baby might find your yelling funny and may continue to bite for the reaction.
since my first experience of being boo's new teething toy, i've been bit an additional 3 or 4 times. on each occasion i broke the latch, firmly said no and ended the nursing session temporarily.