Studies using CT scanning on the lower jaw have confirmed long-held clinical impressions that a significant amount of bone mass in the mandible is typically lost in the course of normal aging.
The mandible of an older person becomes greatly reduced in size, a gradual but progressive change that is further aggravated by loss of any teeth. It is common for the ramus and angle of the jawbone to become thinner and course noticeably more oblique in direction.
Since cosmetic jaw reduction is a relatively modern operation, there are no long-term follow-up studies on young patients who have undergone surgical mandibular reduction for only mild jaw prominence.
Especially if performed aggressively to achieve an exaggerated egg-shaped lower face, further natural bone loss with aging could compound the result leading to objectionable lower face deformity well before old age.
Jaw reduction is now commonly performed in some Asian countries with little concern for this or similar unknown later consequences. Western surgeons tend to be more conservative and emphasize non-surgical approaches in all but extreme cases
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Jaw Reduction Overview
What's so different about Asian jaw reduction?
Asian Jaw Shaving Reduction Surgery
Jawline reshaping using various methods of mandibular bone shaving and reduction
Asian Jaw Moving Surgery
Orthognathic surgery to improve upon projection or poor symmetry on the lower face
Asian Double Jaw Surgery
Maxillofacial surgery of both jaw bones to reshape the face
Anatomy of Asian Jaw Reduction
Major structures and landmarks on the mandible, or lower jaw bone
Natural Bone Loss in the Mandible
Age-related volume loss suggests caution with aggressive jaw reduction surgery
Asian Non-Surgical Jaw Reduction
Nonsurgical jaw slimming from Botox injections into the masseter muscle
Botox and Asian Jawbone Reduction
Don't count on Botox reshaping the mandible.