Why Is Hair Bleach Dangerous to Hair?

If I added blonde streaks to my hair (bleached it), then dyed it back to dark brown the next day, am I at risk for any hairloss because of this? I did this about 7 weeks ago and there are no problems at all — I’m just wondering. Isn’t hair above the skin level dead anyway, so I could put paint and it wouldn’t affect the follicle?

Hair dyes use chemicals to set color into the hair. If you can get the effects you want from a water soluble solution, it should not hurt your hair. As a result of the abrasive nature of the heavy peroxide based dyes, they can cause damage to the hair and the hair follicle with a person who does not have experience with it. Some of these chemicals can cause local scalp irritation and allergic reactions which should be tested against a small part of your scalp skin to see if you are sensitive to the chemicals before applying all over the head. It sounds like your treatments did not cause you any bad outcomes, however, that is not to say that you are safe from hair loss from repeated dye sessions if they are anything more than a good commercial hair rinse.