An awesome Dutch researcher may have found a treatment to combat the enemy of manicurists everywhere — nail biting! First of all, apparently there are 600 million of us, some of whom take nail biting to the extreme, causing bleeding cuticles and "disfigurement". Gross. The doc has designed an invisible tooth guard that can be removed for eating but makes it impossible to bite fingernails... or toenails. People do that, you ask? For serious. We knew a guy in college who kept a jar of his toenail clippings for future cravings. We are totally forwarding him this doctor's info. [MSNBC]