My kitten used to bite whenever I petted her, even though she liked the attention. I would tell her "NO bite!" and rub my palm over her face briefly. She learned not to bite, and my discipline did not hurt her, just startled a bit. Oh, and right after I would do it, I would continue to pet her nicely, if she didn't bite. She obviously wanted the petting, she just didn't know how to properly show her affection.