Can You Use Toner To Fix Hot Roots?
No, toner cannot fix hot roots. Hot roots occur when the hair closest to the scalp turns out lighter or warmer than the rest of the hair due to overprocessing or using too high of a developer volume. To fix hot roots, hair color needs to be reapplied with a lower developer volume or color corrective techniques need to be used. Toner only helps to tone down brassiness or yellow tones in already processed hair.