Which tool is commonly used to smooth the surface of nail enhancements?

The tool that is most commonly used to smooth the surface of nail enhancements is the buffer. Buffers are specifically designed to refine and polish the surface of the nails, making them smooth and shiny after the application of enhancements such as acrylics or gels. They come in different grits, allowing the nail technician to achieve various levels of smoothness and shine, making them essential for a professional finish.

In contrast, a cuticle pusher is utilized primarily to push back and tidy the cuticles, while a nail file is mainly employed to shape the edges of the nails rather than smooth the surface. Nippers are tools used to trim excess cuticle or hangnails and are not intended for smoothing surfaces of nail enhancements. Each of these tools serves a specific function, but for the purpose of achieving a smooth and polished look on enhancements, the buffer is the clear choice.