The basics Toppik Hairline Optimizer is uniquely designed with irregular teeth to help you mimic a natural hairline when applying Toppik Hair Fibers. The benefits Prevents Hair Fibers from falling onto your forehead. The uses Works with Hair Fibers to eliminate any unnatural straight lines along your hairline and gives a soft, natural look. The bottom line To get more precise, defined results, use with the Toppik Spray Applicator to target the hairline.