The PPD-free PTDS-based hair dyes were recommended to all 13 subjects ... will tolerate the newer permanent and demipermanent hair coloring products based on PTDS. Although these products do ...

Permanent hair colour doesn't have to require a tonne ... comes in various colours from blue to hot pink. The dye is ammonia-free, PPD-free, and sulphate-free to reduce any potential damage ...

Hair dyes can be an exciting way to refresh your look, but understanding their risks ensures you make informed beauty choices ...

Objective: We examined whether individuals allergic to PPD will tolerate PPD-free hair dyes containing PTDS ... permanent and demipermanent hair coloring products in which PPD has been replaced ...