Final answer:
To predetermine the results of a chemical relaxing treatment, a strand test is necessary to assess the hair's strength, elasticity, and potential damage.
Step-by-step explanation:
To predetermine the results of a chemical relaxing treatment, it may be necessary to take a strand test. A strand test involves taking a small section of hair and applying the relaxing treatment to see how it reacts. This test helps determine the effect of the treatment on the hair's strength, elasticity, and potential damage.
For example, if the hair becomes weak or breaks after the test, it indicates that the relaxing treatment may be too harsh or damaging for the hair.
Therefore, a strand test is an important step in ensuring the safety and desired results of a chemical relaxing treatment.