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AAD.org talks about your hair and what you need to do to keep it looking good:

"Once the hair has been chemically dyed, it strips the protective lipid layer of the hair shaft and opens up holes in the hair shaft, allowing the dye to enter and create a new color," said Dr. Draelos. "Hair dyeing is damaging no matter what color or what kind of hair dye you use, but lightening your hair color more than three shades requires higher volumes of peroxide — which in turn creates more holes in the hair shaft and causes more damage. So, the best thing a woman can do if she wants to cover her gray hair is to stay 'on shade' — or to dye her hair within three color shades of her natural color. Typically, dyeing hair darker is better than dyeing it lighter."