The vertical platysmal bands that become more visible over time. Relaxing them smooths the neck and can soften the line of the jaw.
The vertical bands that show up in the neck, especially when you clench or turn your head, come from the platysma muscle becoming more prominent over time. Relaxing it with Botox smooths those bands at rest and, for many patients, has the side benefit of softening the line where the neck meets the jaw.
This is general education, not a treatment plan. What you actually need depends on your anatomy, muscle strength, and goals — Rocio determines that with you in person.