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Questions and Answers

What is the main cause of temporary shape changes in hair?

Breaking of hydrogen bonds between amino acids of the same chain (correct)

Formation of ionic bonds between keratin molecules

Breaking of disulfide bonds

Formation of hydrogen bonds between amino acids

What is the purpose of applying cosmetics for shape change in the temporary change process?

To increase the elasticity of the hair

To form a film along the hair shaft and facilitate styling (correct)

To re-establish the original shape of the hair

To break the hydrogen bonds

What occurs during the 1st phase of the temporary change process?

The hair is moistened with water, breaking the hydrogen bonds (correct)

The hair is dried with a heat tool

The hair is styled with a mechanical action

The hair is treated with a chemical relaxer

What is the result of re-establishing new hydrogen and salt bonds during the 3rd phase of the temporary change process?

The hair is given a new shape Signup and view all the answers

What is characteristic of the temporary shape change stage?

It is a reversible stage that lasts for hours or days Signup and view all the answers

What is the highest temperature that can be applied to wet hair in the 4th Phase?

200 °C Signup and view all the answers

What is the primary purpose of applying cosmetics after styling in the 4th Phase?

To maintain the hairstyle for longer and protect it from mechanical deformation, wind and humidity Signup and view all the answers

What is responsible for the hardness and resistance of the hair?

Disulfide bonds Signup and view all the answers

What is the purpose of applying the reducing liquid in the permanent change process?

To break the disulfide bonds Signup and view all the answers

What is the final step in the permanent change process?

Lightening, conditioning, and styling the hair Signup and view all the answers