Hair grows not at the same time. That's why a course works, not a single session.
At any moment only part of the follicles are in the active growth phase — that's what the laser can see. The rest are dormant, waiting for their cycle. That's why we quote not a visit but a course from the start: how many sessions your zone needs and what the whole course will cost.
One session physically can't remove everything
This isn't studio marketing, it's how hair growth actually works. Three reasons why a course is the only format that works.
The laser only sees an active root
The beam is absorbed by the melanin in the hair and reaches the follicle. If the hair has separated from the root and the area is dormant, there's nothing to transfer heat to. That follicle will have to wait its turn.
Phases don't line up with each other
Neighboring follicles run on different clocks: one is growing, another has already shed, a third is resting. That's why each next session "catches" a new batch — and the zone clears gradually.
Interval matters more than quantity
Coming in too early means treating an area where there's almost no active phase yet, and wasting a session. That's why we set the interval to match the area: 4–6 weeks for the face, 6–10 weeks for legs and back.