The chin is one of the most defining features of the lower face. Beyond shaping facial balance, it plays a central role in how expressions are perceived. Yet, over time or with repeated muscle activity, the chin can develop an uneven, dimpled surface often described as an “orange peel” or “cobblestone” appearance. These changes, medically referred to as mentalis wrinkles, may make the face appear tense, tired, or prematurely aged, even when you are completely at rest .
Botulinum toxin injections provide a safe and effective non-surgical way to address this concern [1]. By carefully targeting the mentalis muscle, the small but powerful muscle responsible for lifting and wrinkling the chin, the treatment relaxes excessive contraction, smoothing the skin’s surface and softening its texture. The result is a natural-looking, more relaxed chin profile that restores harmony to the lower face.
When performed with precision and knowledge of facial anatomy, this treatment not only improves chin aesthetics but can also enhance the overall balance of facial expressions. For patients seeking a subtle yet noticeable refresh without downtime, botulinum toxin remains one of the most trusted solutions.
The mentalis is a small paired muscle that sits at the very front of the lower jaw. Each half originates from the incisive fossa of the mandible (just below the lower front teeth) and inserts directly into the skin of the chin. It is supplied by the marginal mandibular branch of the facial nerve. When it contracts, it elevates and pushes the lower lip forward and bunches the overlying chin skin, which is why pouting or expressing doubt makes the chin look puckered.
In some people, the mentalis works harder and more often than it needs to [2]. Genetics, habitual expressions (lip pursing, clenching), dental or skeletal issues that keep the lips from closing easily, and age-related changes in the skin can all encourage this muscle to stay slightly “on.” Constant pull from the mentalis tethers the skin down to the muscle in tiny points, creating multiple shallow dimples, often called an “orange-peel” or “cobblestone” chin. As collagen and elastic fibres decline with age and the fat layer thins, the skin becomes less able to rebound, so the texturing shows more readily.
Repetition matters. Lines that first appear only with movement can, over time, imprint the skin and remain visible even at rest. The nearby labiomental crease (the fold between the lower lip and chin) can also deepen when the mentalis is overactive, especially in a retruded chin or after tooth loss, because the muscle strains to help close the lips and stabilise the lower lip.
How mentalis overactivity shows up
Understanding this anatomy explains why precise relaxation of the mentalis with botulinum toxin smooths the skin, softens the crease, and restores a calm, balanced look to the lower face.
Botulinum toxin is a purified neurotoxin protein that temporarily interrupts the communication between nerves and muscles [3]. It does this by blocking the release of acetylcholine, the chemical messenger that signals muscles to contract. Without this constant signal, the targeted muscle relaxes for several months until the nerve endings regenerate.
When carefully injected into the mentalis muscle, botulinum toxin reduces its tendency to contract excessively. This precise relaxation achieves several important cosmetic benefits:
Because the injections are highly localised, only the mentalis muscle is affected. The surrounding muscles that control natural functions like speaking, chewing, and smiling remain fully active. This selectivity is what allows the treatment to deliver subtle, natural-looking results, a smoother, more relaxed chin that blends seamlessly with the rest of the face.
Treating mentalis wrinkles with botulinum toxin is a simple, minimally invasive procedure that can be completed in just a few minutes, with little to no interruption to your daily routine.
The outcome of botulinum toxin treatment for mentalis wrinkles develops gradually, allowing the chin to appear smoother in a natural, subtle way. Results are not permanent, but they are long-lasting, and with proper maintenance, many patients enjoy a consistently refreshed appearance throughout the year.
When carried out by a qualified and experienced medical professional, botulinum toxin injections for mentalis wrinkles are considered very safe. The procedure involves small, targeted doses and is performed with precision to minimise risks.
Most side effects are mild and short-lived, typically settling within a few hours to a few days:
Because the mentalis muscle sits close to muscles that control lower lip and mouth movement, improper placement or excessive dosing can occasionally result in temporary complications, such as:
These rare events highlight why it is crucial to choose a practitioner with advanced knowledge of facial anatomy and injection technique. In skilled hands, the treatment is not only effective but also carries a very low risk profile, allowing patients to enjoy smoother, more relaxed chin contours with confidence.
When considering botulinum toxin for mentalis wrinkles, two important factors often guide a patient’s decision: the cost of treatment and the qualifications of the practitioner. Understanding both ensures you know what to expect financially while also giving you confidence that the procedure will be carried out safely and professionally.
If a dimpled or “pebbled” chin is affecting your confidence, consulting a certified medical professional is the safest and most reliable way to explore whether botulinum toxin can help restore a smoother, more relaxed appearance.
Botulinum toxin offers a safe, precise, and effective way to smooth mentalis wrinkles, restoring a softer and more balanced appearance to the chin. By targeting the overactive mentalis muscle, the treatment reduces tension, eliminates the cobblestone texture, and enhances overall facial harmony, all with minimal downtime. With results that develop naturally and last for several months, it is a trusted option for those seeking subtle yet noticeable improvements.
If you are concerned about a dimpled or “pebbled” chin, schedule a consultation with APAX Medical & Aesthetic Clinic to learn how botulinum toxin can help you achieve a smoother, more confident look.
Yes. Botulinum toxin for mentalis wrinkles can be paired with dermal fillers when there is a deep crease or volume loss, providing both smoothing and added chin projection.
You may be a good candidate if you are bothered by chin dimpling or cobblestone texture. A doctor will assess your muscle activity to confirm suitability and safety.
Stay upright for at least 4–6 hours, make gentle facial movements, and use a cold compress if needed. Avoid rubbing, strenuous activity, or facials for 24 hours.
Subtle changes are usually visible within 3 to 7 days, with the full smoothing effect appearing around 10 to 14 days after treatment.
Results typically last 3 to 6 months. The duration may vary depending on factors such as your muscle strength, skin condition, and metabolism.
Yes, when performed by a trained doctor, the treatment is safe and well-tolerated. Most side effects, such as minor swelling or redness, are temporary.
Mild redness, bruising, or swelling may occur. Rarely, if the toxin spreads to nearby muscles, temporary effects like lip heaviness or asymmetry can happen.
Yes. By relaxing the mentalis muscle, the treatment can soften the labiomental crease and reduce upward chin rotation, improving facial balance.
No. Botulinum toxin for mentalis wrinkles is precisely targeted to the chin area only, so the rest of your facial expressions remain natural and unaffected.
The cost in Singapore usually ranges between SGD $180 and $400, depending on the number of units used, the brand of botulinum toxin, and the doctor’s expertise.
Most patients can return to work or daily activities immediately. Minor redness, swelling, or pinpoint bruising may occur but usually resolves within a day.
Botulinum toxin is generally suitable for adults aged 18 and above. It is most commonly sought by patients in their late 20s and older, when wrinkles become more noticeable.
Dr. Moses Ng is a distinguished professional in the field of aesthetic medicine, renowned for his expertise in advanced cosmetic procedures. With over 15 years of experience, extensive training and a keen eye for detail, Dr. Ng specializes in a wide range of treatments, including injectables, laser therapies, and acne scar management.
Dr. Moses Ng’s commitment to excellence and patient-centric approach have earned him a reputation as a trusted clinician in aesthetic medicine. His continuous pursuit of the latest advancements in the field ensures that his patients receive the highest standard of care and the most effective treatments available.
