Frown line treatment, also known as glabellar lines, are the vertical wrinkles that form between your eyebrows over time. These lines often appear due to repetitive facial expressions, aging, and a gradual loss of skin elasticity. While they may add character to your face, many people prefer to reduce or eliminate them for a more youthful appearance. Luckily, there are a variety of treatments available, ranging from natural remedies to medical interventions, to help you smooth out these pesky lines.