Not all nails are created equal, and neither are nail files. Do you have artificial nails? Make sure to use the right type of nailfile. Artificial nails are much tougher and stronger than natural nails and need a rougher file. These types of files can be found in any drugstore or beauty supply store. Make sure to maintain your manicure by keeping a file near you in case you get a snag...you don't want the artificial nail to rip off!