Why this site is about width rather than about the jaw
A general guide to chin surgery describes how the profile is changed. That is a different measurement, made on a different part of the same bone, and it is covered by the parent site in this cluster. This site is about the width of the lower face as seen from the front, which is where the jaw angle, the masseter muscle and the fat over both of them compete as explanations.
Why the diagnosis is the decision
Three layers can produce one appearance and only one of them is treated by removing bone. Almost everything useful on this site follows from that: the examination that separates them, the imaging that measures the bone, and the honest conclusion that a jaw can look wide for a reason that has nothing to do with the mandible.
How it is reviewed
The content is medically reviewed by Tongchun Mao, MD, head of aesthetic surgery at Chongqing West District Hospital, and the review date appears on every article. The site names no product and no brand, quotes no dosage and no price, guarantees no outcome, and states plainly that removing bone is easier than restoring it and that swelling hides the result for months.
What this site cannot do
It cannot tell you how thick your mandible is, where your marginal mandibular nerve runs, or how much of the width in your face is bone. Those come from an examination and from imaging. Read this site to arrive at that appointment able to ask which layer is responsible, what the imaging shows, how much can safely be removed, and what the swelling will hide and for how long.