As long hairs use up the energy and prevent all of it reaching the hair root, ideally hairs should only be 1 to 2 mm long when patient comes in for the treatment. By avoiding any other form of epilation, plucking or waxing in the month leading up to the treatment, it ensures as many follicles as possible contain hair, and thus can be destroyed by the light. Additionally, bleaching should also be ceased in the weeks leading up to the termination.