Long Fingernails

About two years ago I quit biting my fingernails. I had always bit my nails. Always. When I was very young my mom would try to clip my fingernails and I would wince and cry during the whole experience. 

I finally quit because my dentist told me I was ruining my teeth. Now the desire to preserve my pearly whites keeps me from chomping, though sometimes when I get nervous I get the urge...