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To predetermine the results to be expected from the straightening treatment, what is necessary to take?

  1. Density test

  2. Finger test

  3. Relaxer test

  4. Pull test

The correct answer is: Relaxer test

The other options, including density test, finger test, and pull test, are not necessary for determining the expected results from a straightening treatment. The density test is used to determine the density or thickness of the hair, which is not necessarily related to the expected results of a straightening treatment. The finger test involves running your fingers through the hair to check for tangles or damage, but it is not specifically relevant to the expected results of a straightening treatment. The pull test is used to check the strength and elasticity of the hair, which is also not directly related to determining the expected results of a straightening treatment. The correct option, C, suggests that a relaxer test is necessary, as it is used to test the hair's reaction to the straightening chemicals and assess the expected outcome of the treatment.