08/08/2026
Why can masseter Botox sometimes cause an asymmetrical smile? š
The risorius muscle sits close to the masseter and plays an important role in pulling the corner of the mouth outward when we smile.
If Botox is placed too close to the anterior border of the masseter, the toxin can diffuse into the nearby risorius muscle, temporarily weakening it and potentially causing an uneven or asymmetrical smile.
Thatās why precise placement and a strong understanding of facial anatomy are so important with masseter Botox.
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