In nail technology, what is the purpose of using collagen in a polish hardener?

Using collagen in a polish hardener primarily serves the purpose of strengthening nails. Collagen is a protein that plays a crucial role in the structure and strength of nail tissues. When included in nail products, collagen can help improve the resilience of the nails, making them less prone to breakage and damage. This added strength can contribute to healthier-looking nails and promote their growth over time.

While other options like restoring moisture, enhancing shine, and removing discoloration may be associated with different constituents or formulations in nail care products, they do not directly relate to the specific function of collagen in a polish hardener. The formulation aimed at strengthening nails leverages collagen's natural properties to support nail integrity, making it a beneficial ingredient in this context.