Hair dye is a chemical product for treating her, with each combination of chemicals creating a specific color. If these chemicals go bad in some way, the color doesn’t turn out as planned.

Despite what the instructions say, I apply dye to dry, not wet, hair. It’s easier to see where you’re putting the color. I use a toothbrush instead of the applicator brush because it’s more ...

“Given the recent North American data as well as the importance of PTDS as an alternative hair dye option for some patients with PPD contact allergy, we advocate that PTDS be considered for ...