Rachel Bilson Bilson's hair always looks fresh worn down because she opts for natural-looking color and keeps highlights to a minimum. Thomas suggests using single-process color only (if your hair is straight) in order to protect it from obvious damage. He also recommends using a good fortifying shampoo and conditioner (try L'Oreal EverStrong Shampoo and Conditioner, $5.99 each) to help hold onto hair color and prevent strands from looking "messy."
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