What would you use for smoothing the nails?

The correct choice is the buffer, which plays an essential role in the nail care process. Buffers are designed specifically to smooth the surface of the nails, enhancing their appearance by removing ridges and imperfections. This tool typically has different grits, allowing for a graduated smoothing effect, and is often used at the end of a manicure to achieve a glossy finish.

While files are commonly used to shape and shorten nails, they may not smooth the surface as effectively as a buffer does. Pushers are tools that help to push back cuticles and are not intended for smoothing the nail surface. Cuticle removers are substances used to dissolve dead skin around the nails and also do not aid in smoothing the nail itself. Therefore, the buffer is the most appropriate choice for achieving smooth and polished nails.