Epilators pluck out individual hairs using a series of rotating tweezers. As they remove hair from the root, the hairs become much finer over time, and you will find that your legs stay smoother for longer.
However, epilators can be extremely painful and can occasionally cause ingrown hairs. Soak your legs in a warm bath before epilating to reduce pain. Exfoliate your skin using a loofah to gently dislodge any trapped hairs.