It's awful. He never bites them but just picks away constantly at the nails and the skin around them. They are looking horrendous at the moment and I know from my own past experience that once the nails go down as far as that, they never recover and will always look strange.
I can't paint anything on them, as he never bites but what can I do to make him stop? He's 6 and obviously a nervous little boy, but still full of fun, enjoying school and has plenty of friends. It's just a bad habit.