Masseter Botox can reduce excessive muscle activity and, in selected patients, create a slimmer lower-face appearance. Reducing the size and strength of the masseter changes lower-face width, proportions, soft-tissue support, jawline appearance and chewing strength. For the wrong patient or when treatment is too aggressive, the face may look too thin, older, hollow, less defined, more jowled or asymmetrical.
Potentially. When masseter volume decreases, the relationship between the muscle and overlying soft tissues changes. In a patient with pre-existing laxity, age-related tissue descent, thin skin, low facial volume or poor lower-face support, reducing masseter bulk can make jowling more visible.
Potentially, if excessive slimming creates hollowing or makes laxity more apparent. A younger-looking face is not simply a smaller face.
Sunken or hollow-looking cheeks have been reported after masseter treatment. The appearance may result from changes in lower-face muscle volume and the visual relationship between cheek and jaw.
Yes, although this is uncommon when treatment remains appropriately within the masseter. Smile limitation or asymmetry can occur if toxin affects nearby expression muscles.
Yes. Temporary reduction in chewing force is a recognised effect because the masseter is a chewing muscle. Mild reduction may be expected; severe or prolonged functional difficulty should be reviewed.
Instead of the muscle becoming uniformly smaller, one segment may continue contracting more strongly than surrounding treated fibres. Patients may notice a lump or muscular bulge when clenching.
Yes. Reasons include different baseline muscle sizes, different muscle strength, uneven toxin response, different doses, injection placement, skeletal asymmetry and chewing habits.
There is no universal number. Dose depends on toxin formulation, muscle size, muscle strength, treatment objective, sex, anatomy and previous response. The objective should be sufficient treatment, not maximum treatment.
These objectives overlap but are not identical. A patient seeking relief from clenching may not want maximum cosmetic reduction in muscle size.
Yes. Repeated reduction in muscle activity can produce cumulative changes in masseter bulk. The same dose should not automatically be repeated at every appointment.
If jowling became more visible primarily because of reduced masseter support, the appearance may improve to some extent as muscle volume returns. Underlying laxity may still remain.
Not automatically. Structural filler may improve a genuine deficiency, but using filler simply to compensate for excessive muscle reduction can start a cycle of slimming the jaw, losing support and adding filler.
Before treatment, assess the face at rest and while clenching, masseter size and strength, lower-face width, jawline, chin support, jowls, skin elasticity, cheek volume, asymmetry and whether the objective is functional, aesthetic or both. The question is whether making the masseter smaller will actually make this particular face look better.
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