Dear Ouidad: How often is too often to color hair?

A: If the hair is very gray, then I recommend my customers to do one process every 6 weeks and do a front hairline touch up two weeks after that. Then, wait 4 more weeks and do the whole head roots again. That will stretch your color to 12 weeks. The less you do color, the better it is for your hair. For highlights — every 10 weeks.