I have a good friend who has used a little baking soda on the tounge when her little boy has bitten before. It is really gross she says, but it has cured him of doing it, and seems a little less "violent" than biting them back. That seems like it would send the message that whoever is bigger wins, but that is just me. I will say that when my 2nd bit once, I flicked her on the cheek right next to her mouth once, and it did surprise her a bit. She never bit again, but I think it is more her personality than my actions. I can say now, that I would do the baking soda or even soap etc. before anything else physical, but we all make mistakes and learn from them. Hope something helps soon!!