But for body resistance weak people, its automatic regulating body temperature, make the body to maintain normal temperature of ability is bad, so when systemic or a local cold jiuyi cold. And we use hot water after shampoo, because tepid effect, make the scalp blood capillary dilate, airframe to around radiation heat increased,chi hair straighteners, at the same time because after shampoo hair is wet, there are large moisture to evaporate out, I'd like to take a lot of heat. Generally a gram water evaporated will take 500 calories.

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