I'd like to add something which may be of inspiration for fellow nail biters.
I've had this nail biting issue ever since I was a child (I'm now 25). I couldn't use the willpower to stop, nor anyone telling me how disgusting it was. I was addicted and I found it very hard to stop. I would chew, no matter what location I was in. Private or public, it didn't matter to me. I didn't like the fact I did this but, it was too hard to stop. Tried keeping my hands occupied and that never worked. Even when I wasn't thinking about biting them, my hands just subconsciously moved to my mouth without me even realising until it was too late.
I would not only bite the finger nail. I would also bite until they bled. If I couldn't get access to the fingernail, I would bite around the fingernail and then try get the skin. I often felt pain in my fingers and finger tips which seemed everlasting when they did get taken too far. This didn't stop me doing this again after the pain subsided though.
So the way I managed to stop was using a product called Mavala Stop. It works just like all the others available. This was just painted over the nail. I was that psychologically attached to nail biting, it made me scared, nervous and upset applying it for the first time. I could never remember having nails and the thought of having them again scared me. Chances are, you will get used to the product. It isn't designed to stop you. More so, remind you what you are doing. It worked for a little bit and then I just lost track and was back in my old ways.
After a small break, I tried the product once again but, with even more determination to end this. Make sure that whoever is around you is always supporting you. Without my GF reminding me when I was slipping, or even taking an interest in my nails becoming better, this wouldn't have worked. You realise once this goes into your mouth and you will take them out. It becomes very foul when mixed with saliva. It's important that you DO NOT forget to apply them to your nail on a regular basis! I started out applying twice a day.
I've been with my GF for 6/7 years now and, only now has she ever seen my fingers with actual proper nails on them. I now don't display signs of going backwards.
Due to my past, some of my nails are very weak and flimsy. So I need to keep applying some nail hardener.
Pics related. Before actually looks like a good day
Before I started the treatment:
And this is me now:
While some people just look at those without much finger nails and think it's disgusting. They don't realise just how hard it is for some people to actually break the habit.