What is the main purpose of using tonics in skincare?

The primary purpose of using tonics in skincare is to restore pH balance. After cleansing, the skin's natural pH can become disrupted, particularly if a cleanser is alkaline. A tonic helps to bring the skin back to its ideal acidic state, ensuring it remains healthy and hydrated. This balancing effect is crucial because when the skin is at the correct pH level, it functions optimally, maintaining its protective barrier and overall health.

While tonics may provide additional benefits like hydration or calming the skin, their core function is focused on restoring balance after cleansing. Other options, such as providing moisture or removing makeup, are typically functions associated with moisturizers or cleansers, respectively, rather than the primary role of a tonic.