Although temporary, BOTOX can be safely injected into the jaw muscle (masseter muscle) at intervals of three to six months.
Weakening the muscle's nerves leads to atrophy or shrinkage that may last for up to six months.
If the main determinant of jawline width is too prominent a mandible bone, injecting BOTOX will make no difference.
The effect of muscle injections can vary widely, from almost undetectable to undesirably extreme. If the masseter muscle is not overly developed to start, BOTOX injections may simply shrink the muscle enough to make the prominent bone underneath it appear even more objectionable.
Eliminating behaviors such as teeth clenching or constant gum chewing that may stimulate muscular development may also be of some value.
BOTOX has also been reported to shrink an enlarged parotid gland (salivary gland) present underneath the masseter muscle without affecting saliva production. While this can magnify the effect of jawline slimming, whether it is a safe to do so repeatedly is another question.
More on Asian Jaw Reduction >
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.