I personally don't use my finger nails. I keep them cut, namely because I find that having long nails hinders my tapping... that and I can't stop chewing them off dammit. Anywho, I keep mine short, but I'd imagine that your nails are growing whether you notice it or not. It's like your hair, it just seems to suddenly get longer and longer and you've no recollection when that happened. File them down every so often and keep them well groomed and they should grow, but don't hold a guy who knaws his finger nails off to anything he says.