This is one of the few products I’ve ever read about in a magazine and then sought out immediately for purchase. I don’t recall the publication, but I do know that it was several years ago and I had to search high and low to find it.
No Bite is “a bitter flavored nail bite deterrent that helps break the annoying and often painful nail biting habit.” I used it more for my cuticles than my nails, but the idea is the same. It looks like nail polish, and it smells (and tastes) like nail polish remover. Once you paint it on it seems to disappear, but then later when you mindlessly slip your finger in between your teeth you’re greeted with a disgustingly awful flavor. The aversion therapy worked so effectively for me that I still have a pretty full bottle of the stuff. A little goes a long way.
My fiance, who wears fake nails specifically to avoid biting her real ones, says that a similar product didn’t work for her. She must have had a powerful compulsion, because I can’t imagine fighting past the flavor of No Bite. In fact the only problem I had was accidentally tasting it on my fingers while eating. Use of a fork would pretty much solve that problem.