One study found that the hair was significantly weaker after bleaching. Your hair could become weaker and less able to retain moisture Your hair could turn white from the oxidation process, de-coloring the pigment. Your hair could lose all pigment and turn white In addition to leaving bleach on your hair for too long, there are other dangers related to using this type of dye. Any longer than that and you run the risk of serious damage, including brittle strands. The maximum amount of time you should leave bleach on your hair is 30 minutes. There’s a misconception that bleach will work better the longer you leave it on. What happens if you leave bleach on your hair for too long?
