I screamed the first time and he laughed at me

That was on Saturday and then he didn't do it again till today.
I thought he had finished feeding when he bit me so I took him off but ended up feeding him again before he went to bed and he did it again even though he was hungry.
He has hold of his teething ring pretty much the whole time he is up (except when feeding), I put some teething liquid on his gums though and no biting at the last feed.
I wouldn't mind so much but each time it has been the right hand one so now I have one normal boob and one really sore one.
Will try telling him no and putting him on the floor if he does it again, am a bit scared of feeding him now though