What factor can affect the client's response to laser treatment?

The client's hair color and growth cycle significantly influence their response to laser hair removal treatments because these factors determine how effectively the laser targets and interacts with the hair follicles. Different hair colors contain varying levels of melanin, which is essential for the absorption of laser energy. Darker hair typically absorbs more light energy than lighter hair, making laser treatment more efficient and effective for clients with darker hair.

Moreover, the growth cycle of the hair is also crucial, as lasers are most effective during the anagen (active growth) phase. Hair that is in the telogen (resting) or catagen (transitional) phases is not as susceptible to the laser's effects, resulting in less effective hair reduction. Therefore, both hair color and growth cycle directly contribute to the overall success of the treatment in achieving desired results.