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I have shoulder length hair and I wouldn't cut it off (unless necessity arrives) because I would rather let it grown than short or shaved. It's a preference issue. However, I don't use expensive shampoo or brush it all.
However, I've been told countless times that hair is a sign of vanity, it dosen't matter what length but at the same time, my hair isn't a example of beauty and I couldn't care less about using products or combing it just to make it gorgeous. It dosen't seem natural to me. I just wash it with whatever shampoo that is available. Period.
But, sometimes, I ask to myself if the fact that having hair on your head is a kind of attachment or not. I know that only monks have to shave their heads but why do the lay people not? BTW, why do the lay people isn't obliged to have the same restrictions that monks have to avoid attachment and practice detachment (I'm not referring to aversion) ?