What nail grit sizes are suitable for which stage of treatment?

In nail care, different grit sizes are used for various stages of treatment. Coarse grits (60-100) are suitable for shaping and shortening nails, while medium grits (180-240) are effective for smoothing the nail surface and refining the shape. Fine grits (240-400) are ideal for buffing and finishing, creating a smooth, polished look. For natural nails, a grit of 240 or higher is preferred to avoid damage.