When should brushing of the hair be avoided?

Brushing of the hair should be avoided before chemical services because this can cause significant damage to the hair. When applying chemical treatments, such as perms or color, it's important to work with hair that is not overly manipulated or stressed. Brushing can cause the hair to become tangled or frayed, leading to breakage and uneven results during the chemical process.

In general, when the hair is brushed before chemical services, it can disrupt the cuticle layer, making the hair more susceptible to damage and affecting the evenness of product application. Chemical services often require hair to be in a more natural state to ensure the best absorption and reaction of the chemicals used.

Other scenarios, like brushing before blow drying or haircutting, typically do not pose the same level of risk, and brushing before washing is often used to remove knots and make the wash more effective. However, caution should always be taken with brushing before chemical treatments to maintain the integrity of the hair.