Which abrasive file would you use to shape a weak natural nail?

When shaping a weak natural nail, the ideal choice is to use a file with a grit level that is fine enough to minimize damage while still effective in shaping. A 240-grit file strikes this balance perfectly. It is coarse enough to make effective adjustments to the nail’s shape yet fine enough to prevent causing excessive stress or injury to a weak nail.

Using a finer abrasive, like a 400-grit file, could potentially be too gentle, making it less effective in shaping, while coarser files, such as those at 60 or 180 grit, are too aggressive and could lead to further weakening or splitting of the natural nail. Therefore, 240 grit is the most appropriate choice for handling weak natural nails safely and effectively.