Botox can soften the vertical lip lines around the upper and lower lips. These vertical lines appear worse during talking, drinking from a straw, and general lip pursing. Treating this area with Botox will also prevent the lines from becoming deeper. An advantage of having this treatment done is it often makes the lips appear slightly fuller. This is because the muscle that wraps around the mouth will be relaxed, gently everting the lips in a very natural way.