While we all have been guilty of using hair dye (for some atleast once in their lifetime Or someone like me who has used it regularly since the greys started showing up), it is imperative that we educate ourselves on the damage it can casue, the ingredients which are harmful, what to watch out for and see if we can switch to less harmful ways of colouring our hair.
Some hair dyes contain chemicals like ammonia, peroxide and p-phenylenediamine (PPD), which can cause skin irritation, allergic reactions & respiratory issues. Long term exposure to these chemicals has been linked to more serious health concerns. Additionally improper use, such as leaving the dye on for too long can damage the hair leading to breakage, dryness & scapl burns. Its important to follow instructions, perform patch tests & consider using products with safer more natural ingredients.
Source: https://www.ewg.org/research/dye-dangers-harmful-chemicals-hair-coloring-products-and-their-health-concerns