Concentrating, raising your eyebrows, squinting or frowning – whenever you move your face, your forehead muscles contract. After years of frequent contraction, combined with environmental and lifestyle factors, such as exposure to pollution, sunlight and smoking, wrinkles begin to form. The main reason forehead lines occur is due to a decrease in the production of elastin and collagen in the skin. These proteins are responsible for our skin’s elasticity, but the production of these proteins decrease as we age.