Is it possible that hair follicles could have been damaged/destroyed by hair chemicals, such as repeated bleaching of hair? If so, is it possible to restore damaged hair follicles?

Hair follicles grow through the skin. These follicles arise from the bulb which is located 5-6 mm below the skin edge. Between the skin edge and the bulb, there is a ‘tunnel’ which allows the waxy sebum to rise out of the follicular unit to the skin. In theory, this tunnel could become a two way highway allowing chemicals, dyes or bleach to find their way deep into the hair follicles (note: the drawing is simplistic for illustrative purposes only). Through this route, it is possible to damage the machinery that grows hair either by killing it, or damaging it so that the hair that grows out might be a smaller gauge hair that has a different character to it. The question you ask is whether or not this process be reversed, and the answer really depends upon how much damage was produced. Generally the hair is quite a robust organ and will recover from insults. Hopefully in your case, the damage is such that it is reversible.

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