Frown lines are among the common concerns that develop as we age, typically making their presence known in our 30s and becoming more pronounced in our 40s. These lines, along with other facial lines, creases, and wrinkles, including forehead lines, crow's feet, bunny lines, nasolabial folds, and fine lines, are the result of several factors. These factors include the gradual loss of collagen, elastin, and skin hydrators, repetitive facial expressions, the influence of gravity, and mechanical compression. Frown lines specifically arise from the repeated furrowing of the brows during facial expressions.