Botulinum toxin type A (BTX/A) is injected into the masseter muscles to reduce excessive clenching and teeth grinding (bruxism), helping to relieve jaw tension, facial pain and associated headaches.

This treatment is sometimes referred to as “masseter Botox” in aesthetic contexts.

As muscle activity decreases, gradual reduction in masseter bulk may occur, leading to a softer jawline contour over time.

🕒 Onset: Improvement is typically noticed within 1–2 weeks

⏳ Longevity: Typically 3 – 6 months; Changes in jaw contour usually become noticeable after several weeks.