My daughter seeks oral input more often especially when she is upset. We got her a chewy necklace that she wears everyday and redirect her to use it whenever she seeks oral input and she tries to bite. My daughter loves crunchy and gummies like textured snacks. We offer these snacks whenever she seeks oral input.

We are doing it for my daughter and she loves it.

Yes I have been doing that for him and he does love it but still bites

Same situation here. My 8 y.o. bites the part between his thumb and forefinger for the exact same reasons. Its his left hand and its been black and blue for over 2 months now. I purchased a stick of cocoa butter and have him apply it everytime i catch him doing it. He doesnt like the taste so he doesnt do it as often now but the damage is still highly visible.