I’ve read that you should never file your nails back and forth because it can damage the nails, causing them to split and crack. I’ve also read that this is a myth and it’s fine to file back and forth. Which is it?
If you’re filing down the natural nail, it’s OK to file back and forth using a 240-grit file. Once you’ve filed it down, “seal” and smooth the edge of the nail by using a shiner buffer and gently “file” from one edge to the other. This technique will prevent splitting and cracking.
— Alisha Rimando Botero is the executive vice president and creative director for Artistic Nail Design.