Hi jennalee,
Botox Cosmetic or Dysport if used appropriately may be able to change the shape of your face, but this change occurs slowly. Botox Cosmetic and Dysport have been used to slim the jawline by reducing the masseter muscle on the sides of the jaw, thus avoiding plastic surgery. Results are typically seen after several weeks and maintained for several months. Treatment doses for slimming the jaws are typically higher than standard Botox Cosmetic used for wrinkles in the forehead or Crow's feet. Jaw reduction, with Botox or plastic surgery, is more common in patients from Asian countries, such as China or South Korea. Botox treatment is performed in the office, and anesthesia is not required.
If large jaw is due to bone, then surgery would be required to slim the jaw line.
Generally, most plastic surgeons would avoid treating young patients with Botox or similar treatments. However, some specialist may offer treatment with consultation with your parents. Only after a comprehensive evaluation together with you and your family can a plastic surgeon or Botox specialist can help determine appropriate options for you. Best of luck.
Dr. Chaboki