Hair dye

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Salon-Perfect Color Starts Here
"Toothpaste will remove dye stains along the hairline. It's drying, though, so apply moisturizer afterward."

"Don't shampoo your hair for 24 to 48 hours after dyeing. Detergents in shampoo can flush out color molecules."
—Marie Leppard, senior colorist at the Julien Farel Salon in NYC

"In the same way that a hot clothes dryer can fade black and bright colors, heat-styling dulls your color. Before you blow-dry or use styling tools, apply a thermal protectant (like L'Oréal Paris Boost It Blow Out HeatSpray)."

"Avoid metal brushes, which get hot under a blow-dryer. They'll dry your hair in a flash, but you sacrifice the brightness of your color."
—Kyle White, colorist at the Oscar Blandi Salon in NYC