What should be done before applying a perm solution?

Before applying a perm solution, it's essential to conduct a patch test to check for allergic reactions. This step is critical because perm solutions contain strong chemicals that can cause adverse reactions in some individuals. A patch test involves applying a small amount of the perm solution to a discreet area of the skin, usually behind the ear or on the inner arm, and observing for any signs of irritation or allergy over a specified period, typically 24-48 hours. This precaution helps ensure the safety and well-being of the client before proceeding with the treatment on their hair.

While trimming the hair, washing it with shampoo, or coloring it might be part of the overall hair care regimen, these actions do not assess potential allergies to the chemical components in the perm solution, making them less critical in comparison to conducting a patch test.