Hair Color Lightener Practice Test

Brushing introduces friction to the scalp before a chemical service, which can irritate sensitive skin. The scalp is delicate, and applying chemicals over irritated skin increases the risk of redness, itching, or a burning sensation during processing. This is why scalp irritation is the most likely outcome.

Color unevenness comes from how evenly the color deposits and interacts with hair porosity and processing time, not from brushing right before the service. Dandruff is a scalp condition unrelated to brushing. Hair breakage is more about how you handle the hair during processing and its condition; while aggressive brushing can contribute if the hair is fragile, pre-service brushing is not the primary cause of breakage—scalp irritation is.