Which nail shape is most likely to break easily?

The stiletto nail shape is most likely to break easily due to its design and structure. Stiletto nails taper to a sharp point, which means that there is less contact surface area with the underlying nail bed and the surrounding environment. This slender and pointed form is inherently more fragile than other shapes, making it more susceptible to bending and breaking.

In contrast, nail shapes like square, oval, and round offer more width and strength at their tips, distributing pressure more evenly. These shapes provide more support and resistance to force, reducing the chance of damage during everyday activities. Therefore, while each nail shape has its unique aesthetic and practical qualities, the stiletto's extreme tapering significantly contributes to its vulnerability to breakage.