Definition of a jawline is essentially based on two issues. One is how slender a patient is renders a thinner covering over the bones, and then essentially when it comes to a jawline, definition is often associated with the wider the jaw and the skinnier the neck, the more defined the jawline will be. Therefore, you can add definition to a jawline essentially by placing implants at the risk of potentially masculinizing a jaw. Additionally, you can add definition by having the patient lose weight. Sometimes you can add definition to a jawline by advancing the chin if the patient has what is called microgenia, or a weak chin, as this will often tighten up the neck and the submental region of the neck and improve the definition along a jawline.