Hi Jagger's Mom
I allow Nash to bite my hands when we play, she has learned to mouth my hands gently. If she gets carried away, I yell OUCH, and she knows that she has gone too far

As soon as my hands stop, she stops, and starts licking them.
I think there have been previous posts on this subject, and how to teach them to mouth you softly. It is supposed to be important for them to learn. Try using the search button at the top of your screen ... I have found it to be helpful in the past too.
Good luck, let us know how things are going.