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The masseter muscles are large, paired muscles found on either side of the lower jaw. Their primary role is mastication (chewing), and they are among the strongest muscles in the body relative to their size. You can feel them contract when clenching your teeth, as this movement activates the muscle fibres.
In some people, the masseters appear more prominent because of genetics, while in others they may gradually increase in size through habitual use. Activities such as frequent gum chewing or jaw clenching can contribute to this enlargement. A common factor is bruxism, the involuntary or habitual grinding and clenching of teeth, which often occurs during sleep. Over time, the repetitive contraction of the masseter muscle can cause hypertrophy (increase in muscle bulk), giving the lower face a more square or angular appearance.
Ageing can also influence the appearance of the jawline. Changes in bone density, soft tissue volume, and skin elasticity interact with muscle activity to alter the balance of the lower face. When the masseters are overactive or enlarged, these age-related changes can appear more pronounced. Conversely, a reduction in their use may gradually change the outline of the jawline, sometimes creating a softer or more oval profile.
Because the masseters are linked to the temporomandibular joint (TMJ), changes in this muscle group can influence how tension is experienced in the jaw. Some individuals with strong or overactive masseters may report associated symptoms such as jaw tightness, clenching, or discomfort. However, the degree to which these symptoms appear varies between individuals and depends on multiple factors, including dental health, stress, and muscle activity patterns.
All clients are required to attend a one-on-one consultation before commencing any treatment that may involve a prescriptive medication. Each consultation is scheduled for a minimum of 45 minutes, allowing time for a thorough discussion and assessment.
During your consultation, our team will take the time to understand your goals, review your facial anatomy, and discuss how the natural ageing process and muscle activity can influence the lower face and jawline. This helps us provide clear information about which treatment options may be suitable for you, so you can make informed decisions about your care.
At your appointment, you will also receive personalised aftercare guidance, with a copy emailed to you for easy reference.
We welcome questions and encourage you to bring along anything you’d like to discuss — your consultation is the ideal opportunity to explore your concerns in detail.