C.A.
I am almost 57 and have been a life long fingernail chewer. I have had periods in my life when I did not chew, the longest lasting 11 years. The first time I was really successful was with false fingernails. I had previously tried the nasty stuff and even surgical tape. Every time a stressful situation would come up (except in that 11 year period) off came the nails. The only other times I have been successful occurred during periods when I was either taking antidepressants or antianxiety medication. After studying my problem, I have come to the conclusion that fingernail biting is a form of obsessive/compulsive disorder, which may have a strong genetic component. Two of my three children also bite there nails to some degree. I agree with the others that it will not stop until the child decides to stop. Personally, i would not punish the child. Distract if you want, try the nasty stuff, try the homeopathic stuff with your doctor's okay, but don't sweat it. If in every other aspect you child is happy and healthy then don't make an issue of it. My parents tried with me to some extent and then just let me decide when I was ready. It the total course of human history and the universe, it is really not very important.