Bleach is extremely drying and tough on hair and can even damage it as well as follicles which produce the hair. The shorter answer to your question is that YES, bleach CAN make hair fall out but, it's usually because it is so dried/damaged that it “breaks” and makes it appear as though it's falling out.
So, what do you do if your hair is falling out from bleach?
What do I do if my hair is continuously falling? I use hair oil or shampoo, but neither seems to help. Purchasing hair oil treatment and applying shampoo in the shower will help build natural oil glands to support the scalp. Apply permanent hair color to dye the hair after bleach to rebuild its chemical attraction.
Also, can bleach permanently damage your hair?
In short, the general consensus amongst the celebrity colorists that I consulted with is that, yes, dying and bleaching your hair permanently alters the integrity of your hair. "Bleaching your hair is going to damage it faster than coloring, so be sure to always follow with at-home care," he explains.
Does coconut oil help bleached hair?
Bleaching doesn't just break down melanin and the cuticle structure, but also the fatty acids within the hair and other integral hair proteins – causing that straw-like feeling. To add fatty acids back into the strands, use coconut oil treatments. Repeat oil treatments on a weekly basis until hair is back to healthy.
How long does it take for bleached hair to go back to normal?
Although the bleached roots will start to revert to the original hair color after a short period of time, they may not become completely visible for a longer period of time, maybe as long as two weeks. Generally speaking hair grows 1/4 to 1/2″ per month although for some people it's faster and others slower.