You need to pay attention to the temperature of the water in order to show the cooling effect of shampoo, which is said to be helpful for hair health I think it's better to wash it with cold water than warm water. I'm sure there are a lot of people who know... I heard that if you have scalp heat, your hair follicles will be destroyed. So it's best to lower the scalp temperature as much as possible... It's not a big deal. It's about protecting your hair I think this butterfly effect is interesting
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