Dear Elahe62,Thank you for your question. The frown lines between your eyebrows seem to be very mild. It is unclear from this picture whether you need filler there or not and also whether your botox treatment was fully successful or not. As a national and International NEF Faculty Member for Botox for the last 20 years, it has been my experience that many providers do not know how to achieve the maximal botox response in the frown area. It could be that your treatment was not adequate both in exact location and in dosage. This could be determined by a thorough examination in person and if that is indeed the case, you could take care of your issue with just a simple and very low cost botox injection top up. Otherwise you would need a thin hyaluronic acid filler gel placed very carefully since this area is fraught with risks such as skin necrosis, blindness etc for fillers. Make sure you see a board Certified Facial Plastic or Plastic Surgeon to ensure safety and successful treatment. Best Wishes in your quest, Dr. Anna PetropoulosBoard Certified Facial Plastic Surgeon, Boston's Back Bay and North Shore