Final answer:
To create an arch on flat fingernails, nail enhancements like acrylic, gel, or polygel are used to sculpt the desired curve and improve nail appearance.
Step-by-step explanation:
The correct answer is that when a client has flat fingernails and more building is needed to create an arch and curve, professional nail technicians typically use a nail enhancement product such as acrylic, gel, or a polygel. These materials can be sculpted to form the desired arch and give the nail a more aesthetically pleasing appearance.
Nail enhancements require a careful application process, which starts with preparing the natural nail by cleaning and buffing. Acrylic enhancements are made by creating a mixture of a liquid (monomer) and a powder (polymer) which, when combined, form a malleable bead. This bead is then shaped onto the nail with a brush and allowed to harden, creating the desired curve.
Gel enhancements involve applying layers of a gel product that is cured under a UV or LED light, while Polygel combines the properties of both acrylics and gels for ease of application. Whatever the material chosen, the goal is to create a more balanced and visually appealing nail that provides the base for further nail art or polishing.