New Jersey Cosmetology and Hairstyling Practice Exam

What should be done before a chemical treatment to ensure the health of the hair?

1. Perform a strand test

2. Wash the hair with shampoo

3. Apply a deep conditioning treatment

4. Trim the hair ends

The correct answer is: Perform a strand test

Performing a strand test is crucial before a chemical treatment because it helps determine how the hair will react to the chemicals being used. This test assesses the hair's strength, elasticity, and porosity, providing insight into how the hair might respond to the treatment. By taking a small section of hair and applying the chemical product, the stylist can observe any changes, ensuring that the hair is not overly damaged or compromised before the full application. This proactive measure aids in preventing potential adverse reactions, ensuring the overall health of the hair during and after the chemical treatment. Other options may contribute to hair care, but they do not provide the specific insights needed for the application of a chemical treatment. For example, washing the hair with shampoo cleanses the hair but does not evaluate its health or reaction to chemical products. Applying a deep conditioning treatment nourishes the hair but does not assess its condition. Trimming the hair ends can improve the appearance of hair, but it does not provide information about the hair's chemical compatibility or potential damage outcomes. Therefore, the strand test stands out as a necessary precaution in the chemical treatment process.