Well, leaving henna on your hair for several hours can eventually cause hygral fatigue. Rinsing the mud out, I imagine, is somewhat abrasive to the hair surface. My hair does feel a bit weak after being wet for so long, but I'm still sure it's less damaging than box dyes. Some deposit dyes could probably be less damaging. I've tried some, but I like how henna makes shiny hair look more dramatically shiny, since it's so different in light and shade.
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