How is the strength of the nail affected?

The strength of the nail is indeed influenced by the shape of the apex. The apex of the nail is the highest point, which contributes significantly to its overall structure and strength. A well-defined apex provides the nail with the necessary curvature and rigidity, allowing it to withstand everyday stresses and pressures without bending or breaking easily. This shape helps distribute pressure evenly across the nail, preventing weaknesses that can lead to splits or breakage.

Other factors like the size of the nail bed and moisture levels certainly play roles in nail health and appearance, but they do not directly correlate with the inherent strength that the apex provides. The color of nail polish does not impact the nail's physical strength; it's primarily an aesthetic consideration. Therefore, the shape of the apex is a critical determinant in the mechanical strength of the nail itself.