Not being a nail biter, I dont really have any useful advice to add to this particular thread. But I can say that I have never had the urge to do it, because I know where my fingernails have been and it's usually really disgusting, especially at the place where I work. I just usually end up humming a song to myself until I calm down.
You could try communicating that biting nails is really dirty and it's a bad idea, could make you sick, etc.
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E fuhtan ruf syho baubma femm ihtancdyht drec saccyka?
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