Permanent hair color typically lasts for approximately 1.5 to 2 months (six to eight weeks) before a touch-up is usually needed.
While the color itself is permanent and won't wash out like temporary or semi-permanent dyes, its appearance changes over time due to hair growth and other factors. Here's a breakdown of what to expect:
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Root Regrowth: The most noticeable reason for a touch-up is the appearance of your natural hair color at the roots as your hair grows. This is especially apparent if you've significantly lightened or darkened your hair.
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Fading and Toning Changes: Although the color molecules are permanently deposited in the hair shaft, environmental factors like sun exposure, washing with harsh shampoos, and heat styling can cause the color to fade or change tone over time.
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Why Touch-Ups Are Needed: To maintain a consistent color from root to tip, most people require a root touch-up every 4-6 weeks, depending on how quickly their hair grows and how different their natural hair color is from the dyed color.
In summary, while permanent hair color does change the hair permanently, the noticeable aesthetic change needing correction usually occurs within 1.5 to 2 months.
