C.B.
This is kind of sad but when I was little I also bit my nails...my mom had a jar of what I though was "duck poop" (we went to a lake with ducks often) and kept telling me that if she saw me bite my nails she will put the poop on my hands at night. Come to find out it was melted dark chocolate but it worked, I have never bit my nails again. It also worked with the pacifier and my sister =)