While occasional hair colouring may not cause severe harm, excessive use of chemical-laden dyes can have long-term consequences. Here’s a deep dive into the dangerous side effects of frequently ...

Women who regularly use permanent hair dye may be putting themselves at increased risk of bladder cancer, new research findings suggest. The study is the first to show that how often you use hair ...

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 ...