Flyaway Hair
A: My first recommendation is to shift to a volumizing shampoo and moisture rich conditioner to get a little body back into your hair. You can still use the color extending product, just cut back on the frequency.
What's most likely happening is that the color extending product has shifted the balance of oils and color molecules in the hair. The shift in oils and moisture being responsible for the fly-away hair, while the added colorant molecules making the hair heavier and flat at the scalp area. This could simply be the way the product interacts with your particular hair type as opposed to being an actually fault in the product.
Another tip to add body back to the hair is to rinse the hair (after shampooing and conditioning) with Witch Hazel, then style the hair as normal. You can combat the flatness by lifting the hair at the scalp as you dry it to create root lift.
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See also:
How can I get rid off flyaway hair strands?
Quick fixes for common hair problems
How to tame frizzy hair