What legal claims are being made against hair dye manufacturers regarding cancer risks, and what does the scientific evidence show about exposure risks?

Attorney Alan Smith has filed a lawsuit against 13 hair dye manufacturers on behalf of Hector Corvera, who developed bladder cancer allegedly from occupational exposure to hair dyes. The lawsuit accuses companies of manufacturing unsafe products containing known carcinogenic chemicals and failing to provide adequate warnings. While research shows limited evidence linking consumer hair dye use to cancer, multiple studies indicate increased bladder cancer risks for salon workers with repeated occupational exposure to these chemical products.