Frown lines are wrinkles seen when we contract our underlying facial muscles. In some of us, this causes chronic furrows or creases. Lines can get etched into the skin even at an early age. This can produce a worried, discouraged or angry look on the face. The best treatment for frown lines is Botox, which is very effective at softening these lines. If the lines are very deep and can also be seen at rest, the addition of a filler to "fill" the lines further can be very useful.