H.K.
I had a friend suggest to me to plug her nose when she does that and she will have to let go with her mouth. Once she realizes she isn't getting "food" then she may stop it, it may take a few times of that. Another thing I did with my kids was just say "NO bite!" in a sharp tone (just a serious, sharp tone should be enough at this age to get them to stop doing what they are doing).
Hope something helps.