Without keratin, the hair structure is compromised, making it brittle and difficult to style. One of the last - and most serious - dangers of bleaching is the hair’s loss of keratin, which is a type of protein that makes up the hair. “However, excessive porosity and dehydration leads to the destruction of the hair shaft and might cause irreversible damage.” Your hair could lose keratin “Moderate porosity makes the mane look more voluminous and easier to hold curls,” explains Goddard. This is when the hair cuticles are too widely spaced, making it difficult for the strands to retain moisture. Even skin that the bleach had touched was affected.īleach has also been known to turn the hair highly porous. 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?
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