Why this site starts after the diagnosis, not before it
A general guide to jaw contouring establishes whether the width of the lower face comes from bone, muscle or fat, and whether an operation is the honest answer. That work is done by the parent site in this cluster and is not repeated here. This site begins where that question has been settled in favour of the bone, and deals with what follows: which part of the angle a resection removes, and how much can be taken.
Why the limit is the subject
An angle resection is one of the few aesthetic operations whose central decision has no way back. Bone that has been removed cannot be restored to what it was, and the amount that can safely be removed is set by the canal carrying the nerve to the chin and by the vessels running close to the surface of the bone. Almost everything useful on this site follows from that: why under-reduction is the correctable error, why the amount is fixed from imaging, and why the swelling has to be waited out before the shape is judged.
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 numbness of the chin and lower lip is expected rather than rare.
What this site cannot do
It cannot tell you how thick your mandible is, where the canal runs inside your own bone, or how much of the width in your face is skeletal. Those come from an examination and from imaging. Read this site to arrive at that appointment able to ask which part of the angle would be reduced, what the imaging shows about the safe limit, where the nerve and the vessels lie in your case, and what would be done if too little had been taken.