Bare Essentials Nail File - 6.5
Bare Essentials Nail File - 6.5 is the correct way to file your nails is to file from the side of the nail to the centre and then from the other edge back to the centre in smooth even strokes.
Do not file in different directions. File (bevel) the top of the nail slightly flat if it becomes too pointed. Never file nails after swimming or bathing as nails are at their weakest.
A trick when filing weak, soft nails is to file before removing polish.