The active hair growth phase represents an average of 20% of hair. The target LASER the pigment of the hair at a high temperature, which will result, during this anagenatic phase, to a complete atrophy of the blood vessel, while the other sleepy phases of the hair, 80% of them, will not have a sufficient impact on the hair heat to affect blood source.
This is why it’s important to shave , or stimulate hair, between visits, to increase the number of hair remaining in their growth phase.