Newer permanent and demipermanent hair dyes that have replaced PPD with para-toluenediamine sulfate (PTDS ... allergic to PPD will tolerate PPD-free hair dyes containing PTDS.

Sometimes wrong hair color, chemical reaction, or wrong care can damage the hair. In such a situation, by taking care of some ...

For example, sulfates are sometimes thought to be bad for hair—but not always. When we hear about a sulfate-free hair ... can also strip and dull your hair color, says Jennifer Korab, a ...

A chemical compound used in many permanent hair dyes has been named Allergen of the Year for 2025 by the American Contact Dermatitis Society (ACDS). Toluene-2,5-diamine sulfate (PTDS) is an ...

To prevent damage, you should also limit other treatments, like hair dye, bleach, and chemical treatments. 5. Use sulfate-free shampoo Sulfates are chemicals found in most shampoos and soaps that ...