Breastfeeding Mommas! Please help!

My eight month old bites my nipple about once or twice a day since he started getting teeth (about when he was 4 months). It hurts so bad and then on top of that no matter how little or much I trim his nails he pinches me multiple times when feeding and it really hurts! I have scratches and pinching marks all over my breasts!

I’ve tried making it known to him that it hurts and I either take his hand off or mouth off when he does either of the two and sternly say no but that’s not doing anything.