Final answer:
The application of a chemical relaxer for hair straightening necessitates the use of a protective base cream on the scalp before applying the relaxer to prevent irritation.
Step-by-step explanation:
The procedure you are referring to involves the use of chemical relaxers for hair straightening. When applying a chemical relaxer, it is essential to use a protective base cream on the entire scalp before the relaxer is applied. The protective base cream acts as a barrier, protecting the scalp from potential irritations and burns that might occur due to the strong chemicals present in the relaxer. After the cream is applied, the relaxing process can safely begin, with the hair being flattened during the chemical reaction.