Sasha, my tuxedo short-hair, 21 lb. bowling ball of a boy cat, loves my nail files. He puts his paw up to my fingers as I'm filing and then wants me to rub the nail file (the newer and less worn the better) across his face, really hard, and he purrs and gurgles. And also he likes it across his teeth(!) and whiskers. He just loves the nail file. I'm not adverse to doing his face to please him and send him to kitty nirvana, but teeth? Wouldn't it wear down the tooth enamel from the abrasiveness of the file material? Has anyone ever had this experience?? Quirky boy.