how do you get this habit to stop? He definately does it when he is nervous/anxious, and he plays at a rep level in soccer and is doing it there. He says he likes playing and he says he isn't nervous, but today during the whole practice he was biting his finger nails!
My ds has gone through periods of nail-biting. The first round I resorted to bribery to get him to stop. He stopped for over a year. He's doing it again now. He's 7.5 years old. I'm not resorting to bribery again, but when I look at his little fingers I tell him that I love those little fingers so much and I wish he wouldn't bite them. I've also touched on some health issues since he bites the skin around them and frequently has small, open areas of skin. I'm not going to be too hard on him though. I constantly pick at my cuticles and skin around my fingers, so I figure the only thing I can do is tell him how I hate that I do that to my hands and that it makes me feel embarrassed sometimes.
Sometimes biting (in the form of biting cheeks, lips or nails) can be a sign of food allergies. I was a nail biter my whole life until I was diagnosed and tested with food allergies and now I finally have nice non-biten nails. I'm sure it can also be a nervous bad habit but I thought the food allergy idea was worth mentioning.