California State Board Barber Practice Exam 2026 – Complete Prep Guide

Question: 1 / 400

Which chemical is commonly used in hair straightening treatments?

Hydrogen peroxide

Ammonia

Sodium hydroxide

Sodium hydroxide is a powerful chemical often utilized in hair straightening treatments, particularly in the process known as lye relaxers. This chemical functions by breaking down the protein structure of the hair, allowing it to be reshaped and straightened. Unlike the other options, sodium hydroxide effectively changes the natural curl pattern of the hair to a straighter form, providing a long-lasting result that can withstand humidity and other environmental factors.

Hydrogen peroxide is primarily known for its use as a bleaching agent and is commonly found in hair lightening products rather than straightening treatments. Ammonia is often present in hair coloring products to open the hair cuticle but is not typically used for straightening. Alcohol, while used in various hair products as a solvent or astringent, does not serve the purpose of altering hair texture and is not effective for straightening.

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Alcohol

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