Fingernail Biting

Isaac bites his nails. It's a bad habit for some, but an addiction for Isaac. His nails are about half the length they should be. Sometimes, though, I suppose his nails are a bit tired of being eaten, so he goes for his toenails. This afternoon I caught him snacking on his toes, and called him on it. He replied, "Yep--I'm just only cleaning my toes," so matter-of-factly. He (finally, after a few independent attempts over the past week) then allowed me to trim and clean his toenails. (His fingernails don't need trimming.)