The safety of a cosmetic product largely depends on the safety of each ingredient in it. Many countries have developed their own list of prohibited or restricted ingredients in cosmetics. Accordingly, understanding and knowing how to check cosmetic ingredients is essential to choosing safe and smart cosmetics.

Hair dye is increasingly popular and used by many people. Using hair dye helps people have impressive and beautiful hair suitable for different ages. Let's answer some of the questions below to explore the details of hair dye. Choose the best answer to the following 14 questions to assess your understanding of hair dye.