The number of sessions you need for laser hair removal will vary depending on: - The amount of hair you have - How dark the hair is - The size of the areas being treated - The frequency of laser hair removal treatments It is important to realize that laser hair removal will require multiple sessions in order to achieve the desired results; one session is not sufficient enough to target all of the hair follicles. The reason for this is that hair grows in cycles, or phases, and not all follicles are growing hair all of the time. Therefore, when you get laser hair removal done, there are some follicles that are inactive, or dormant. These cannot be targeted by the laser, as the wavelengths the laser emits are only absorbed by the pigment in the hair, not the skin. The skin is unharmed in the process. As the laser contacts the pigment in the hair, it travels down into the follicle, damaging it and preventing it from producing future hair growth. As the body is resilient and can bounce back from almost anything, this does not permanently disable hair growth. However, with repeated treatments, the hair follicles will become increasingly damaged, potentially resulting in permanent hair loss.