Paint your Nails with a Nail Hardener:
I recommend using Miracle Nail, which is a nail polish that drys hard, or Sally Hansen Hard as Nails. It’s pretty much Acrylic nail polish. It hardens, and it’s pretty hard to get off. When I’d go to bite my nails, I would just pick at the nail polish. Which was a pain to get off. If it’s hard to get off, you’ll leave it alone
There are solutions in store to help you with your habit. Go to your local drug store and grab some No bite nail polish. This is a nail polish that taste very gross, so when you go to bite your nails you’ll spit it out. The only bad thing about this is, every time you wash your hands, you must reapply the polish to your nails. So it’s a hassle and almost not worth it. It’s not my favorite.