Sit back and relax; it's almost over. What pH level is a sodium hydroxide relaxer – aka a lye relaxer?

Sodium hydroxide reactors – otherwise known as a lye relaxer, the most commonly used relaxer by hair professionals – help break down hair bonds, making curly or wavy hair straighter. Its pH level is 12 to 14, so be sure to get it right; applying lye relaxers incorrectly can damage the hair.

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