why did dye make my hair fall out?
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Hair dyeing weakens the hair. Permanent and semi permanent hair coloring products contain peroxide and ammonia. The ammonia swells and opens the hair cuticle to allow the dyes and peroxide to get inside and cause a color change. These openings are partially closed when a color-stop shampoo step or ph-balancing condition is used. This change in the hair integrity makes colored hair more porous and also weaker, so breakage of dyed hair is usually much more evident.
Hair loss after hair dyeing is common due to the manipulation of the hair shafts during the dyeing procedure.The porosity of the hair shafts is increased when the hair is bleached or lightened. This is why brown hair dyed blond tends to experience more hair loss from breakage than brown hair dyed brown.