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The masseter muscle is one of the main chewing muscles and sits at the angle of the jaw. When it becomes enlarged from genetics, clenching, or chronic gum chewing, the lower face can look broader and heavier.
Masseter Botox reduces excessive muscle activity. That can help both patients who want a softer jawline and patients who suffer from bruxism, jaw tension, or pressure-related discomfort.
From an aesthetic point of view, relaxing a bulky masseter can create a narrower lower face and a more tapered jaw shape over time.
From a medical point of view, it can reduce clenching force, morning jaw fatigue, tension headaches, and pressure on the temporomandibular region in appropriate cases.
The muscle usually starts to feel less active within the first 1-2 weeks, but visible slimming often takes several more weeks because the muscle needs time to shrink after its activity is reduced.
Dose depends on muscle strength, asymmetry, face shape, and whether the priority is therapeutic relief or cosmetic contouring. Over-treatment should be avoided because chewing comfort and smile balance still matter.
Dr. Gemici: A slimmer jawline should still look like your own face. In masseter treatment, balance matters more than chasing the strongest possible reduction.
The best candidates are patients with a strong or enlarged masseter, visible lower-face widening, clenching, bruxism, or recurrent jaw muscle tension.
Temporary soreness, mild swelling, or bruising may occur. In some cases, high dosing can create short-term chewing weakness, so treatment should stay individualized and conservative.
It can reduce clenching force and muscle tension in suitable bruxism patients, although it is not the only part of management.
Many patients notice shape change after several weeks, with clearer contour improvement around 8-12 weeks.
Yes, mildly and temporarily in some patients. That is one reason dosing should be individualized.

Trusted & Professional
Dr. Hamza Gemici is a medical aesthetic physician based in Ataşehir, Istanbul. His practice focuses on natural anti-aging and subtle facial harmonization using botulinum toxin, dermal fillers, periocular rejuvenation and skin quality procedures. All treatments are performed with FDA-approved products under physician-guided protocols.