Which of the following is a function of a toner in a skincare routine?

A toner plays a vital role in a skincare routine, particularly in balancing the skin's pH. After cleansing, the natural acidity of the skin can be disrupted, making it more alkaline. A toner helps restore the skin's natural acid mantle, which is crucial for maintaining healthy skin. When the pH balance is restored, it supports the skin's barrier function, enhances hydration, and prepares the skin for subsequent products in the routine, such as serums and moisturizers.

While toners may have additional benefits, such as providing a fresh feel to the skin or helping to remove residual impurities after cleansing, their primary and most important function is pH balancing. This ensures that the skin can function optimally and remain healthy.