Hi, I am really confused about using hair color. Through study I learnt that hair colors contain chemicals like ppd or ppt, or other carcinogenic substances which may cause cancer in long run. So my questions are: 1. If almost every hair color/beard color contains carcinogenic substances, then why people are using them widely, when it pose a considerable threat to life or is if I am incorrect in believing that they cause cancer in lon run. This question really bothers me and I am prevented from using hair color beard color. I need to use beard color. 2. My this question depends on answer of first question, if its not such a risk then I would have no further question, else - can I use beard color which contains about 2-3% of these substances without any risk of developing cancer in future. Thanks.