Polish, not necessarily – but going for an actual MANICURE… that’s a different story. Most girls would be reluctant to spoil a pretty manicure by biting their nails. And seeing how pretty their hands look would eb a great incentive to keep it that way.
So what do you do if you’re a guy???? I think the bandaid idea works if only because many people bite their nails from stress and subconsciously, as well. If everytime they put their nails to their mouths, tehy encountered a bandaid, it would make them more aware of what they are doing. Self-awareness is the first stp to changing a behavior pattern. Three weeks are not enough to completely alter a behavior. it might be enought o detox a body from drugs, though.