Actually, thick dark hair is ideal for laser treatment because the laser targets the pigment in the hair. The darker and coarser your hair is, the more pigment it contains, which means it absorbs the laser energy more effectively. Where laser treatment struggles is with very light, fine, or gray hair because there's not enough pigment for the laser to target. You might need a session or two more than someone with lighter hair simply because the hair density means more follicles to treat, but you should actually see better results overall. Make sure the clinic you choose has experience treating clients with your hair and skin type, and that they adjust the laser settings appropriately for your needs.