C., I wouldn't make a big deal out of it, really. My 6 year old started chewing on the ends of her hair! I would, of course, ask her to remove the end of the braid from her mouth and with great humor and sarcasm suggest we saute' and serve them for dinner since she enjoyed "eating" them so much! I would comment that "...we only put food into our mouths, if you are hungry let's get you something to eat, you are too old and too wise for me to have to remind you of this." Another time, and the thing that I believe clinched it, was a shoulder-to-shoulder surf on the web for microorganisms we come in contact with. I looked for and found the ugliest, nastiest looking ones and told her "These living bugs most likely attach to the ends of our hair between washings...can you imagine anyone eating this thing? Or it crawling around in your mouth? I cannot imagine anyone as smart as you would knowingly choose to eat this!" Needless to say, it worked and she felt as if the decision to stop was all hers. One day, maybe when she's twenty, I'll tell her from where those nasty criters actually hail, but for now, they were a great drama-free strategy for ending a nasty habit. Good luck!