S.G.
I used a product called Nail Envy. I too was a hard core nail biter. The way I fixed the problem was that I actually had acrylic nails for years--this broke me of the biting habit. Then I removed the acrylics, faithfully applied the Nail Envy, and now have nice long, strong fingernails. If I'm ever tempted to nibble (when I'm reading or watching TV especially) I try to put something else in my hands or I have also been known to sit on my hands. Might be time to take up crocheting!! And if you have someone else in the house who can keep you honest that will help. Most of my biting was unconscious so if my husband pointed out that I was absentmindedly chewing it would remind me to stop. You can do it!!