Forehead lines are the horizontal wrinkles that appear on the forehead as a result of aging, facial expressions, and repetitive movements. They are often more noticeable when a person raises their eyebrows or frowns. These lines can develop at any age but tend to become more prominent over time due to the loss of skin elasticity and collagen. Various factors contribute to the formation of forehead lines, including sun exposure, smoking, and genetics. While they are a natural part of aging, some individuals seek treatments such as Botox, fillers, or laser therapy to reduce their appearance and achieve a smoother forehead.