Oklahoma Cosmetology Board Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Question: 1 / 400

What type of bond is broken during the perming process?

Hydrogen bonds

Salt bonds

Disulfide bonds

During the perming process, disulfide bonds are the backbone of the hair's structure that are specifically targeted and broken to allow the hair to take on a new shape. Hair consists of keratin, which contains disulfide bonds formed between the sulfur atoms in the amino acids cysteine.

When a perm solution is applied, it contains chemicals that break these disulfide bonds, allowing the hair to be reshaped into curls or waves. After the hair is reshaped, a neutralizer is used, which re-forms these disulfide bonds in the new shape, effectively "setting" the perm.

Understanding the role of disulfide bonds is crucial because these are the strongest bonds in hair chemistry, and their breaking and reforming is what enables the permanent alteration of hair texture.

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Covalent bonds

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