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Posts: 23,835
Registered: ‎03-10-2010

How often should one run color thru to ends of hair when doing root touch ups?

I do my roots every four weeks. How often should I run the color thru to ends? And how would you go about doing this. Leave color on the entire 40 minutes- or just for a few minutes? I know you should not do it each time. Is there a time schedule to go by? Thanks for input!