You could have the best cuticle oil in the world and the prettiest nail polish, but if you’re using the wrong nail file, you could be causing unnecessary damage every single time you shape your nails.

As a nail technician, I’ve seen so many people unknowingly weaken their natural nails by using a file that’s too coarse. The right grit can make all the difference, helping you maintain strong, healthy nails without splitting or peeling.

So, what exactly does nail file grit mean, and which one should you be using?

What Is Nail File Grit?

  • The “grit” of a nail file refers to how coarse or fine the surface is.
  • The lower the number, the rougher the file.
  • The higher the number, the finer and gentler it is.
  • Choosing the correct grit depends on whether you’re filing natural nails, gel enhancements or acrylics.
  • Using the wrong grit isn’t just ineffective—it can actually damage your nails.

80 Grit – Extra Coarse

An 80-grit file is one of the roughest nail files available.

This type of file is designed for shortening or shaping hard enhancement products like acrylics. It should never be used on natural nails, as it’s far too harsh and can leave the nail weak, thin and prone to splitting.

If you mainly wear your natural nails, this grit isn’t for you.

100/180 Grit – Perfect for Gel and BIAB

A 100/180 grit file is one of the most popular choices in professional nail salons.

The 100-grit side is ideal for reducing the length of stronger enhancements, while the 180-grit side is much gentler and can be used for refining the shape of gel, BIAB or builder gel nails.

If you regularly have professional nail treatments, this is a handy file to keep at home for small touch-ups between appointments.

240 Grit – The Best Choice for Natural Nails

If you’re looking after your own natural nails, a 240-grit file is usually the safest option.

It’s gentle enough to shape the nail without creating tiny tears or weakening the free edge.

This is the grit I recommend most often to clients who want to grow stronger, healthier, natural nails.

It allows you to tidy your nail shape while protecting the nail plate from unnecessary damage.

Why Does Grit Matter?

Using a file that’s too rough can leave tiny splits along the edge of your nail.

These small cracks may not be visible straight away, but over time they can lead to peeling, snagging and breakage.

A finer grit smooths the edge instead of tearing it, helping your nails stay stronger for longer.

It’s a small change that can have a big impact on your overall nail health.

How to File Your Nails Correctly

The way you file your nails is just as important as the file itself.

Try to file in one direction using light, even strokes rather than aggressively sawing backwards and forwards.

While the occasional back-and-forth motion isn’t always disastrous, gentle filing helps reduce unnecessary stress on the nail edge—especially if your nails are already weak or peeling.

Take your time and let the file do the work.

Don’t Forget Your Cuticles

Healthy nails aren’t just about filing.

After shaping your nails, always finish with a nourishing cuticle oil.

Massaging cuticle oil into the surrounding skin helps keep your nails hydrated and flexible while leaving your manicure looking fresh and healthy.

It’s one of the easiest ways to improve the appearance of your hands in just a few seconds each day.

When Should You Replace Your Nail File?

Like any beauty tool, nail files don’t last forever.

If your file starts to feel smooth, worn down or becomes difficult to clean, it’s time to replace it.

A fresh, high-quality file gives you more control and creates a smoother finish, making it easier to achieve your desired nail shape.

The Right Tools Make All the Difference

Looking after your nails doesn’t have to be complicated.

Simply choosing the right grit, filing gently and keeping your cuticles hydrated can dramatically improve the strength and appearance of your nails over time.

At Nail Medicine, we believe healthy nails start with the right tools. Whether you’re maintaining your natural nails or keeping your salon manicure looking its best, investing in a quality nail file is one of the simplest ways to protect your nails and achieve beautiful results every day.