I can't believe I've found another mouth-biter!
I have always had oral focused problems, as a baby, I sucked my thumb, young child sucking hair, then biting nails stopped in teens when started smoking, stopped smoking in 20's and didn't think anything of it until someone at work said "why are you always chewing your mouth and twisting it, it's really annoying".
I didn't realise I was doing it, 20 years later there are no signs of stopping. My mouth is lined, I get headaches, my jaw and teeth ache and my face is always contorted. At first I noticed I was doing it when I got hungry or just ate but now I find I am doing it without thinking.
I have tried a therapist (she said "just stop doing it"), flicking a band on my wrist when doing it, trying to be mindful of when I do it and trying to 'just stop', try to let my mouth relax, brushing teeth, gums. Wearing a mouth guard except when eating which gave me a bout of tongue thrush.
I've searched online and found people with similar problems but it all seems to be about biting your cheek accidentally rather than the constant compulsion to nibble those rags of skin - You know what I'm talking about. My tongue can't seem to stop probing them out. I've even thought about piercing it to make it more difficult.
I only ever managed to stop once when I was on holiday, I woke up at 7am with my jaw and teeth throbbing and a headache so I think I was in the mood to have had enough (a bit like starting a diet). I felt my tongue start to move to seek out an uneven piece of cheek and mentally stopped myself by relaxing my jaw and letting my tongue lol, and repeat every time I felt like this (you can only do it first thing on a morning because once you are well into bite-fever you can't stop mid day). I also brushed the insides of my cheeks and lips when brushing to try and get rid of the rags. I tried to be mindful of biting all holiday and managed to continue it when at home. I got used to not doing it and it helped that my sores and rags had cleared up and my cheeks were smooth to stop temptation. It lasted for 3 weeks and then I dared say to DH "have you noticed I haven't been biting for the last couple of weeks" (he didn't notice btw). The day after while eating I bit my cheek drawing blood. I thought "I'll just bite this bit off and even it out" and 4 years later I'm still biting daily.
Watching with interest and might give this nac trichotillomania a try.