By Alessandra Potenza, TheVerge.com, October 10, 2016 The Pavlok promises to help you quit bad habits and it hurts I’ve been trying to quit biting my nails forever, but all techniques have failed. If I apply nail polish, I leave my nails alone but I bite my cuticles. Then when I remove the nail polish, I’m… Continue reading I gave myself electric shocks to quit biting my nails — it didn't work