I have a rather severe biting habit. I've bitten the end of pens, the inside of my cheeks, my tongue, my fingernails, and even my fingers, sometimes to the point that they'll bleed a bit. This is a problem I've had since I was young and I haven't been able to stop feeling the need to do it. I know it's really gross, but I just can't help myself. I've tried gum, but it only last so long until you need to buy another pack and it's just not worth the money to keep on doing that. Idk, I just thought I would share.