Nail biting...

Along with everything else that has already been said, just know that your finger nails harbor bacteria. I tell fh all the time that he's sucking bacteria, especially if you've touched things throughout the day and haven't kept up with washing them every five minutes. When I was in school to get my license as an esthetician, we weren't allowed to have free edge for the very reason of bacteria, while touching a customers skin. This sounds gross, I know, but it was my only advice to stop your nail biting. I've never been a nail biter so I have no idea how hard it may be for you.