Laser hair removal works by targeting and destroying hair follicles. As the hair follicle deep below the surface of your skin absorbs the laser energy, its regenerating structures are instantly eliminated. 

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Laser hair removal only affects hair that is in an active growth cycle. That's why it's important to go through multiple treatments, each several weeks apart (you need to catch each hair while it's growing).

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Some hair may fall out immediately during your treatment, although most hair needs time to shed away from your skin. While you can certainly shave between treatments, it's essential to avoid plucking or waxing treated hair, since you can disrupt the shedding process that occurs after laser treatments.