What is a necessary step before applying a perm solution?

Performing a patch test to check for allergies is a critical step before applying a perm solution. This test involves applying a small amount of the perm solution to an inconspicuous area of the skin, usually behind the ear or on the inner arm, to monitor for any allergic reactions. This step ensures the safety of the client, as some individuals may have sensitivities or allergies to the chemicals used in perm solutions.

While cutting the hair to a desired length, applying a deep conditioning treatment, and using a heat protectant spray may be beneficial during hair care and styling, they do not address safety concerns that arise from potential allergic reactions. Therefore, conducting a patch test is essential for a safe and successful perm application.