When the muscle itself is the problem
Years of heavy clenching don't just tire the masseter — they train it. Like any muscle worked daily, it grows. The result is masseter hypertrophy: a visibly squared, heavier jawline, often with the tension and headaches to match. For heavier clenchers, protecting the teeth with a guard manages the consequences; sometimes it's also worth addressing the muscle directly.
Muscle-level treatment, explained
Clinicians can reduce overactivity in the masseter using prescription muscle-relaxing injections (botulinum toxin). Placed precisely into the masseter, the treatment reduces the force the muscle can generate — easing tension at its source — and over a few months the muscle gently reduces in bulk, which is why the same treatment is well known for slimming a square jawline. Effects build over weeks and typically last several months, after which treatment can be repeated.
Because this involves a prescription-only medicine, it isn't something to buy off a page: it requires a face-to-face assessment with a qualified prescriber, who will take a history, examine the muscles, and decide whether treatment is appropriate for you. That consultation-first approach isn't red tape — it's what makes the treatment safe and the results predictable.
Is it right for you?
It's most relevant for heavier, persistent clenchers — especially where a guard manages the tooth wear but the muscle tension, headaches or jaw bulk remain. It's not a first step for occasional clenchers, and it's not a substitute for protecting the teeth at night. In our own pathway it's severity-gated: the consultation only raises it where it's clinically sensible, and any treatment happens in-clinic with our team in Jersey, Guernsey or London.
Book a jaw tension assessment
If heavy clenching, tension or jaw bulk sounds like you, start with the free online consultation — and where appropriate, we'll invite you to an in-clinic assessment with our clinical team to discuss whether muscle-level treatment is suitable.
Start the free consultation →A note on how we talk about this: prescription medicines can't be promoted directly to the public in the UK, and we don't. This page is educational; whether treatment is appropriate for you is a clinical decision made face-to-face with a prescriber.