B.M.
My oldest was a biter at his daycare and we came up with a "bite kitty" It was a teething ring shaped like a cat and we attached it to a pacifier clip and he had it clipped to his shirt. When he started to act like he was going to bite, we tried to catch it and say, bite the bite kitty. It got to the point that he would put it away or get it if he was having a frustrating moment and bite on it. Now my second son was also a biter and he didn't follow with the bite kitty and was a bit harder to stop. We just had to really keep an eye on him and stop him before it happened. I can't say he was very easy because his twin sister paid for it more than anyone else! I hope the bite toy works for you.
B. M.