The principle
How the result builds
The laser beam is absorbed by melanin — the pigment that gives hair its colour. The energy becomes heat, the heat travels down the hair to the root, and the root loses its ability to produce a new hair. The surrounding skin, which holds far less pigment, stays cool thanks to the cooling.
The effect is strongest on hairs in their growth phase, because that is when the hair is connected to the root and carries heat to it. At any given moment a portion of the hairs in an area are in exactly that phase — and those are the ones we catch.
That is why sessions sit at calculated intervals: each time we catch a different wave of hairs, exactly when they are vulnerable. With every session the area stays smooth for longer, and what returns is less and finer.