Pureology professional hair toner typically maintains colour vibrancy for up to 8 washes, although this timeline can vary depending on your specific hair type, its overall condition, and your washing frequency. Generally, the less often you shampoo your hair, the longer the hair toner's colour will endure. If your hair has a history of previous colour treatments, it may retain hair toner for a shorter period compared to hair that has only been coloured once. If you find that your hair colour toner fades prematurely, several factors could be at play. One key factor is the use of shampoos containing sulfates and parabens, which can strip and dull your hair colour. Opting for Pureology's sulfate-free shampoo is recommended to help maintain your hair toner's longevity. Read our guide to sulfate-free shampoo