Which tool is used to apply heated and focused steam to the client's face?

The facial steamer is the correct tool used to apply heated and focused steam to the client's face. This device emits a fine mist of steam that helps to open up pores, hydrate the skin, and promote circulation. In a facial treatment, the application of steam can also aid in the removal of impurities and make it easier to cleanse the skin deeply. The warm steam enhances the efficacy of facial products, allowing for better absorption and effectiveness in skincare routines. Its use is a fundamental part of many skincare treatments in a cosmetology setting.

The other tools listed serve entirely different purposes; a nail dehydrator is used for nails, a tip cutter is designed for trimming nails, and a nail form is used to shape and mold extensions on nails. Thus, they are not designed for facial treatments or to apply steam.