Nipple biting 😥🤕😁

So I have been exclusively breastfeeding for exactly six months and I am going to continue to breastfeed for as long as my daughter would like. She has had her two bottom teeth for a few weeks now, but it hasn't been an issue with breastfeeding until the last couple of days. Omg it hurts so badly when she bites!! I have tried making sure she is hungry before I nurse, but that's hard because I feed on demand. She's always hungry and always will eat and not turn away. She does it immediately before latching so it's not like she is playing or bored. It hurts so badly it takes my breath away. Help!! Is this happening with anyone else!?