Alexander tells us that there are two different types of files, low and high grit. “A lot of nail files that are sold to the public today come dual sided, so you’re getting both the soft and the abrasive version on one file.” And when it comes to choosing sides, always use the softer, lower grit side on your fingernails and the courser side for toes. “The nails on your fingers are much more delicate and apt to break than your toe nails, so while the abrasive side is too rough for your fingers, it works well on toes because the nail is much thicker. She recommends using a cushion emery board like the Trim Salon Board that has a heavy duty grit on one side and a medium on the other. Plus its only $2.29!