Answer:
A protective barrier should be applied to the hairline and ears before using a chemical relaxer to prevent skin irritation.
Step-by-step explanation:
Before applying a chemical relaxer product on the client's hair and scalp, it is important to protect the skin around the hairline and ears with a protective barrier. This barrier can be in the form of a special cream or gel that is designed to prevent the chemicals from irritating or burning the skin. These protective barriers are essential as the chemicals used in perms and relaxers can be quite harsh. They are also used when applying chemical depilatories, which come in various forms such as gel, cream, lotion, aerosol, roll-on, and powder with common brands like Nair, Magic Shave, and Veet.