The Blacks

{WHAT to do....WHAT to do}.....I have a serious problem with the little man, he started biting his fingernails a couple of weeks ago and it is driving me crazy. It seems like he traded off picking his nose for biting his nails, one is a lot less gross that's for sure. He bites them clear down until he can't bite any more. Any suggestions on how to stop your kid from doing this? I have been pretty lucky that my kids have not had to many crazy bad habits because it bugs when all day long you have to remind them to stop. HELP.....