What tool is primarily used for shaping and smoothing nails?

The tool primarily used for shaping and smoothing nails is the nail file. A nail file is specifically designed to shape the edges of the nail and smooth any rough or jagged areas after trimming. It comes in various grit levels, which allow for different textures and finishes depending on the desired result.

Using a nail file correctly can help achieve a perfect nail shape, whether it is square, round, or oval, by refining the edges without causing damage to the nail. The material of the nail file can also affect its effectiveness, with options available ranging from emery boards to glass or metal files, each providing varying levels of abrasion to meet different nail types and finishing needs.

While a nail clipper is useful for trimming long nails, it does not provide the shaping and smoothing that a file does. A nail buffer, on the other hand, is more for polishing the nail surface and enhancing shine rather than shaping the edges. Lastly, a nail drill can also be used for various purposes in nail care, especially for artificial nails, but it is typically more advanced and not the primary tool for basic nail shaping. Thus, the nail file stands out as the essential tool for this specific task.