I have to use the pulse/power/massage setting on my showerhead just for the water to penetrate all my hair for rinsing, a piffly little stream just doesn't cut it. If anything, I'm probably shedding less because it's massaging the scalp some and stimulating stronger follicles over time. I don't think the pressure or speed of the water in a commercial shower head is going to be dangerous to hair, or they'd have a big old lawsuit on their hands and change the setting anyway.
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