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At Harley Street MD, we use botulinum toxin to safely and precisely relax overactive masseter muscles. The treatment reshapes the lower face without affecting your ability to chew, speak or smile. Dr Chia Tan tailors the dose and placement based on your facial anatomy to ensure natural, symmetrical results — with minimal discomfort and no downtime.
Yes. We allocate sufficient time to assess, consent and treat during your first visit if you're ready to proceed.
Mild swelling or redness at injection sites is possible. Rare side effects include bruising or muscle fatigue when chewing for long periods.
Yes, though we recommend waiting 1–2 days if possible.
Botulinum toxin relaxes the masseter muscles, which are responsible for chewing. Over time, relaxed muscles reduce in size, leading to a visibly slimmer and more contoured jawline.
15–30 minutes, including prep time.
Typically 3–4 months, though it can vary. Maintenance every 4–6 months is recommended for best results.
Avoid rubbing the area for 4 hours
No makeup or lying down for 4 hours
No exercise for 2 days
No saunas, tanning or heat exposure for 2 weeks
If you feel firm bulges near your jaw when biting down, it's likely due to enlarged muscles, not fat.
Most patients describe it as a mild sting or pinch. A topical numbing cream is offered to increase comfort.
You should not receive jawline slimming injections if you: Are pregnant or breastfeeding Have neuromuscular disorders Have an infection at the treatment site Have a known allergy to botulinum toxin or albumin
There’s no evidence of harm from Botox® in early pregnancy, but it's not officially licensed for use during pregnancy. Contact us if this occurs for personalised guidance.
You may start noticing muscle relaxation after 1–2 weeks, with visible slimming from 2–4 weeks onwards.
Yes. When performed by an experienced doctor, jawline slimming is a safe, non-surgical procedure with minimal risk.
The muscles gradually regain function and size. We advise repeating treatment before full reversal occurs.
Avoid aspirin, alcohol, vitamin E and intense workouts before treatment. Eat and hydrate well beforehand.
No. Other chewing muscles compensate, and speech remains unaffected.
Jawline slimming is not suitable if you are pregnant, breastfeeding, or have certain neuromuscular conditions. Please see your doctor if unsure.
Not with us! We aim for a natural look that preserves facial expression.
Causes include genetics, teeth grinding, excessive chewing or habitual jaw clenching. Certain ethnicities (e.g. East Asian) are more predisposed.
We strive for symmetry, but slight natural asymmetries may remain. Dosage is adjusted as needed for balance.
Yes. It relaxes the masseters, reducing grinding and associated symptoms like jaw pain or headaches.
All treatments are performed by GMC-registered doctors only.
The clinic is accredited by JCCP and CPSA, and registered with the Care Quality Commission (CQC) for medical safety and patient care.
The CQC has rated Harley Street MD “Outstanding” in its inspections.
This ensures the highest level of safety, ethics, and professional care in non-surgical aesthetic medicine.
With over 17 years of experience, Dr Tan is a BCAM full member and advanced injector, specialising in natural, proportionate results using advanced techniques.
UK-trained medical doctor, practising aesthetics since 2008
Certified Advanced Injector by Allergan and MD Codes™ expert
Member of BCAM, MRCS(Ed), ECAMS, MRCGP, FHEA
Featured on TV and in media as an expert in cosmetic medicine
In rare cases, a follow-up may be needed after 4–6 weeks, especially if your masseters are particularly large. This would be a repeat full treatment.
