Frown lines, sometimes called worry lines, are the vertical lines that appear between your eyebrows. They are the result of your forehead muscles squeezing inward as you furrow your brows. When you were young, they may have only been noticeable when you made certain facial expressions. Over time, though, the tissue around the muscles might have developed wrinklesthat never smooth out. Treatments available at Dr Kora Aesthetics for frown lines