So DS has started biting infrequently and it hurts soooo much!! Hes got 2 razor blade sharp teeth and he just chomps down and grinds!!! the pain!!! Then my nipples hurt so bad afterwards for at least a day and whenever he feeds

I feel like just slapping him it takes everything in me to NOT do it! How bad does that sound
So can anyone give me some suggestions as to how to make him stop!!