This New York City hair colorist is a celebrity favorite, having worked on everyone from Katy Perry to Jennifer Lopez. And she certainly knows a thing or two about color touch-ups.

Her hero product is the Rita Hazan Root Concealer Touch Up Spray, $25. This water- and transfer-proof spray seamlessly covers grays in between color appointments. You can also use it to cover thinning hair.

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With salons in New York City and Los Angeles, Sally Hershberger is one of the most sought-after celebrity hairstylists in the country. In 2015, she launched her line of luxury hair care products so everyone could recreate her styles from home.

One of her best products? The Sally Hershberger 24K Golden Touch Nourishing Dry Oil, $40. It transforms dry, frizzy, dull hair into smooth, shiny, silky hair when used before heat styling.

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