Which product is typically used to improve the strength of weak nails?

Nail hardener is specifically designed to improve the strength and resilience of weak or brittle nails. It typically contains ingredients that can penetrate the nail and provide a protective barrier, thus reducing the likelihood of breaking, splitting, or peeling. The formulation may include proteins, resins, and other strengthening compounds that work to fortify the nail structure, making it more durable over time.

In contrast, nail polish remover is intended for the purpose of removing nail polish, and while it can sometimes have conditioning properties, it does not contribute to strengthening nails. Cuticle oil is beneficial for moisturizing the cuticles and surrounding skin, promoting overall nail health, but it does not directly increase the strength of the nail itself. A nail file, on the other hand, is used for shaping and smoothing the edges of nails but does not possess any properties that strengthen nails. Therefore, nail hardener is the appropriate choice for individuals looking to enhance the strength of weak nails.