What does it mean when someone goes to a salon to get their roots done?

thanks!!What does it mean when someone goes to a salon to get their roots done?
When someone goes to get their roots done it means they have had their hair dyed and their natural color is peeking through where the dye has grown out. http://z.about.com/d/beauty/1/5/l/G/hair鈥?/a> . see how the top has brunette [her old color] someone would go to the salon to get it back to the blonde at the top. THey re-dye the roots only.What does it mean when someone goes to a salon to get their roots done?
it probably means that they dont have their natural hair color...so when it comes out it starts from the roots ...so like if your natural hair color is blonde and you died it black..later your roots would go blonde...so they go get their roots done and all their hair is black...
It means that there hair is colored and it's starting to show because the hair is growing out. that's when you go to the salon and get the new hair dyed the same color.