The hair shaft is made up of protein keratin and this keratin is intertwined with hydrogen and disulphide bonds.
When you apply any kind of heat to the hair shaft for example hot water, blow drying, ironing, straightening, rebonding or perming you end up breaking the disulphide bonds.
This results in frizzy hair, lustreless hair, dry hair and hair that can break easily.
So, Lukewarm water or water with normal temperature is GREAT
But hot water is definitely a NO
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