Wyoming State Board Cosmetology 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

Which chemical is commonly used in straightening treatments?

Hydrogen peroxide

Ammonium thioglycolate

Sodium hydroxide

The chemical commonly used in straightening treatments is sodium hydroxide. This substance is a powerful alkali that works by breaking down the protein structure of the hair, allowing it to be reshaped and straightened. Sodium hydroxide-based products are typically found in lye relaxers, which effectively alter the hair's texture by causing swelling and softening of the cuticle, making it easier to manipulate and straighten the hair.

Other chemicals mentioned have different uses: hydrogen peroxide is primarily used for bleaching and lightening hair; ammonium thioglycolate is commonly found in curling treatments and can also be used in some straightening methods, but it's more associated with perming; and glycolic acid is often used in skin care for exfoliation rather than in hair straightening. Understanding the specific functions and applications of these chemicals is vital for effective and safe cosmetic practice.

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Glycolic acid

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