What should be avoided before conducting a chemical service on hair?

Before conducting a chemical service on hair, it is crucial to avoid brushing the hair and scalp. This is because brushing can stimulate the scalp and increase blood flow, which makes the skin more sensitive. Additionally, brushing can cause tangles and damage to the hair, making it more susceptible to breakage when chemical products are applied.

It is generally advisable to ensure that the hair is in a calm state and free of excessive tangles or knots before starting a chemical service. This helps in achieving a more even application of the chemical treatment and minimizes the risk of damage. Also, brushing can lift the cuticle layers of the hair, which may lead to the chemicals penetrating the hair too quickly and potentially causing damage.

In contrast, washing the hair can remove buildup and oils that may interfere with the chemical processing, applying conditioner can protect the hair during the service, and using heat styling tools should be avoided as they can alter the hair's structure prior to the chemical treatment.