Does bleach dissolve hair

No, it does not.

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Actually, yes, it can. If we are talking about household bleach. Bleach is actually a solution of some different chemicals, including sodium hypochlorite, which is a bleaching agent, which has no effect on hair other than the oxidization of the pigment in the hair (melanin) leading to the bleaching of the hair. However, household bleaches also commonly contain lye, or sodium hydroxide. It is added to speed up the reaction of bleach. And lye has the ability to decompose the protein of hairs, so basically, it can dissolve hair. That is why lye is a major component of drain cleaners, it dissolves hair build-up. Usually laundry bleach contains less lye, as lye can degrade the fibers of clothing.