So sorry for the very late response! I never got emails updating me that anyone replied to this post/thread!Can you say more about when he bites? Could you attach it to something like anger or frustration or anything else? There are different reasons for children to persist with biting and a little more information about under what circumstances he does it could be helpful.
Also, does he only bite others or does he bite himself as well?
Anyway his biting has gotten worse, he bites out of anger and happiness and he doesn't bite himself but other people and toys that he shouldn't be biting.