What Are Anti-Wrinkle Treatments? How They Work, What They Treat

anti-wrinkle treatments are among the most widely performed cosmetic procedures in Australia and among the most searched, both by people considering them for the first time and by those who want to understand exactly what the injection does and how it works biologically.

This page covers what anti-wrinkle treatments are, how they work at a neuromuscular level, why the effect is temporary, what types of lines they address, and what they cannot do. No brand names are used here because Australian law restricts the consumer facing advertising of specific prescription medicines by name. The product used at your appointment is discussed openly during your individual clinical consultation.

At Core Aesthetics in Oakleigh, all anti-wrinkle treatment is individually assessed and administered by a qualified AHPRA-registered health practitioner. Treatment is only discussed and recommended following a separate clinical consultation. You can explore our full anti-wrinkle treatments overview for more on our approach.

How Anti-Wrinkle Injections Work: The Mechanism

To understand why anti-wrinkle injections produce the results they do, and why those results are temporary, it helps to understand how muscles contract in the first place.

The nerve muscle communication chain

Every deliberate movement your face makes begins with an electrical signal travelling from the brain along a motor nerve to a target muscle. At the point where the nerve ending meets the muscle, a structure called the neuromuscular junction, the nerve releases a chemical messenger called acetylcholine into the gap between the two structures. Acetylcholine binds to receptors on the muscle cell and triggers the contraction sequence. Without that chemical signal, the muscle has no instruction to contract.

This is the mechanism behind all voluntary facial muscle movement. Every expression line you have formed is the result of years of these acetylcholine signals prompting the same muscles to contract in the same pattern, repeatedly folding the overlying skin in the same place.

What the injection does

anti-wrinkle injectable treatment works by blocking the release of acetylcholine at the neuromuscular junction. The prescription medicine in the injection binds to specific proteins inside the nerve ending that are responsible for releasing acetylcholine into the junction. With those proteins occupied, the electrical signal from the nerve still arrives, but acetylcholine is not released into the gap. The muscle receives no contraction signal. It relaxes.

The result in the overlying skin: the repeated folding that creates expression lines stops or is significantly reduced. Existing lines have the opportunity to soften without continued creasing. New creases are not forming in the treated area during the period the medicine is active. This is the mechanism behind the improvement in expression lines that anti-wrinkle treatment produces.

For a more detailed explanation of the mechanism with treatment specific context, see our article on how anti-wrinkle treatments work.

Why the Effect Is Temporary

The body does not passively accept the interruption to neuromuscular signalling. It responds to the blocked nerve ending by generating new nerve sprouts from the motor nerve, a natural repair process called axonal sprouting. These new sprouts gradually establish functional connections with the muscle, restoring acetylcholine release over time. At the same time, the proteins that were blocked inside the original nerve ending are progressively replaced as normal cellular processes continue.

The combined effect is a gradual return of muscle activity over a period of months. This is not a flaw in the treatment, it is the body doing what bodies do. It also means that any unwanted outcome from anti-wrinkle treatment will resolve on its own without any intervention required.

The typical duration of effect is three to five months, though this varies by individual, by treatment area, and across treatment cycles. Higher activity muscles, or individuals who metabolise the product more rapidly, may find the effect lasts closer to three months. People who have been having consistent treatment for several years sometimes find duration lengthening over time, which is thought to reflect some degree of muscle conditioning from sustained periods of reduced contraction. These patterns are discussed at consultation and used to plan the timing of maintenance treatment.

Expression Lines vs Static Lines: What Anti-Wrinkle Treatment Addresses

Understanding the mechanism explains which types of lines anti-wrinkle treatment addresses effectively, and which it does not.

Expression lines (dynamic lines) are lines that form from repeated muscle movement. They first appear when the associated muscle contracts, the skin folds as the muscle shortens, and then resolve or partially resolve when the expression relaxes. Over years of repeated movement, these lines become more permanently established in the skin surface, eventually visible even at rest. Forehead lines, frown lines between the brows, and crow’s feet at the outer corners of the eyes are the most common examples. anti-wrinkle treatment directly addresses the cause of these lines by reducing the muscle activity responsible for the creasing.

Static lines are lines present at rest, not primarily driven by muscle movement. They are caused by volume loss, skin thinning, and the cumulative decline in collagen and elastin that comes with age. anti-wrinkle treatment has limited effect on established static lines, because reducing muscle movement does not address volume or skin quality changes. These require different approaches, dermal filler for volume related concerns, other skin quality treatments for texture changes.

Many people have a combination of both. A skilled practitioner identifies which component of a given concern is likely to respond to anti-wrinkle treatment and which will not, and sets expectations accordingly. Treating only the muscle activity when a line is primarily volume driven produces little visible result. Treating both correctly, anti-wrinkle for the expression component, filler for the volume component, can address concerns that neither treatment alone would significantly improve. This distinction is central to a treatment plan that produces a natural, proportionate result.

What Areas Anti-Wrinkle Treatment Can Address

At Core Aesthetics, anti-wrinkle treatment is used for the following areas, subject to individual assessment at consultation:

• Forehead lines: horizontal creases from repeated upward movement of the brows. Requires careful assessment of brow position, treating the forehead without accounting for brow elevation can cause brow heaviness.
• Frown lines: vertical creases between the brows from repeated furrowing. One of the most consistently treated areas; the result here can significantly change resting facial expression.
• Crow’s feet: lines radiating from the outer corners of the eyes with smiling and squinting. Dosing must respect the muscles involved in natural eye expression.
• Masseter: the chewing muscle at the jaw angle. Treatment can reduce muscle bulk over time, softening the lower face contour, and is also used where jaw clenching (bruxism) is a concern.
• Lip flip: a small amount of product applied to the muscle above the upper lip, allowing the lip to roll slightly outward at rest. Creates the appearance of a fuller upper lip without adding volume.
• Brow position: strategic placement in the forehead and brow area can lift or stabilise the brow tail, addressing descent without surgery.
• Bunny lines: diagonal lines on the nose bridge that appear with strong nose scrunching.
• Gummy smile: reduces elevation of the upper lip during smiling where the gum line is prominently visible.
• Neck bands: platysma treatment for the vertical bands that develop in the neck with age.
• Hyperhidrosis: excessive sweating in the underarms, treated with injections into the sweat glands of the affected area.

The specific areas appropriate for your individual anatomy and goals are determined at consultation. Not all areas are treated in every session. Treatment plans are sequenced based on clinical priority.

What Anti-Wrinkle Treatment Cannot Do

anti-wrinkle treatment addresses muscle driven expression lines. It does not add volume to the face. It does not lift skin that has descended due to volume or structural changes. It does not significantly improve lines that are primarily caused by volume loss, skin thinning, or sun damage. It does not improve skin texture or quality. It does not produce a durable result.

These distinctions matter because people presenting with one type of concern sometimes expect a treatment that addresses a different mechanism. A deep nasolabial fold driven by mid face volume loss will not be significantly improved by anti-wrinkle treatment alone. Lines on the lip border caused by volume loss and repeated pursing may require filler as well as, or instead of, muscle relaxation. Where the concern is structural rather than expression driven, the appropriate response is a different approach, and a practitioner who tells you otherwise is not setting accurate expectations.

Where concerns are driven by volume loss, hollow cheeks, a softened jaw border, temple hollowing, sunken tear troughs, dermal filler is the appropriate approach. Many people benefit from a combination of both, addressing movement related and volume related changes in a coordinated plan. The consultation at Core Aesthetics is where these distinctions are assessed and the appropriate treatment approach is discussed.

Onset, Duration, and What to Expect

anti-wrinkle treatment does not take effect immediately after injection. The medicine begins working as the blockade at the neuromuscular junction takes hold, typically within three to seven days. Full effect, the maximum degree of muscle relaxation the dose will produce, is usually visible at approximately two weeks. This is why the review appointment at Core Aesthetics is scheduled at four to six weeks rather than at two weeks: it allows the full result to be seen and assessed before any review of the outcome.

The onset of expression line improvement follows the same timeline. Lines soften progressively as the treated muscle reduces its activity and the skin has less opportunity to crease. The improvement is most visible at the two week mark, and the review appointment at four to six weeks captures the stabilised result.

Duration of effect varies by individual, treatment area, and dose. Most people experience three to five months of effect before meaningful muscle activity returns. Higher activity areas, or individuals who metabolise the product more quickly, may be closer to three months. The masseter and hyperhidrosis treatment areas often have longer effect durations due to the nature of the muscles involved. Typical anti-wrinkle treatment for expression lines is repeated every three to four months in the early cycles, with intervals sometimes extending as treatment continues.

How Dosing Is Determined

There is no standard dose for anti-wrinkle treatment. The amount of product appropriate for a given area depends on the muscle mass in that area, the strength of the muscle’s activity, the degree of relaxation the client is seeking, and the practitioner’s clinical judgement about the balance between effect and the preservation of natural expression.

Treating a large, strong masseter muscle requires significantly more product than addressing fine crow’s feet in the same person. Achieving noticeable masseter reduction requires a different approach to softening light forehead lines. First time treatment at Core Aesthetics is typically approached conservatively, not as a commercial choice but as a clinical one. How an individual will respond to a given dose cannot be precisely predicted in advance. Starting conservatively and assessing the response before any additional product is added is safer and produces more predictable results over time.

At consultation, the proposed dose for each treatment area is discussed before treatment proceeds. The cost of the treatment plan is based on this assessment, not on a fixed price per unit menu that ignores individual anatomy.

The Regulatory Framework in Australia

In Australia, the products used in anti-wrinkle treatment are classified as Schedule 4 prescription medicines under the Therapeutic Goods Act 1989, regulated by the Therapeutic Goods Administration (TGA). They may only be prescribed and administered by a qualified health practitioner following an individual clinical assessment. This means a clinical consultation and individual assessment are legally required before any product is used.

The TGA’s advertising framework also restricts consumer facing advertising of specific prescription product brand names. This is why reputable clinics, including Core Aesthetics, refer to “anti-wrinkle treatment” or “anti-wrinkle injections” as category terms rather than using brand names in public facing content. The product used at your appointment is discussed openly during your individual consultation.

Under AHPRA’s September 2025 guidelines for registered health practitioners performing nonsurgical cosmetic procedures, a consultation separate from the treatment appointment, a cooling off period, and the involvement of a prescribing practitioner are all required. At Core Aesthetics, these requirements are structural features of how the practice operates, not administrative add ons applied after the fact.

Booking a Consultation at Core Aesthetics

If you are considering anti-wrinkle treatment and want to understand whether it is appropriate for your individual situation, the consultation at Core Aesthetics is the starting point. During the consultation, Corey Anderson (AHPRA registered nurse, ) will take a full medical history, assess your facial anatomy in detail, explain the treatment mechanism and what it would realistically achieve in your specific case, and develop a treatment plan tailored to your individual anatomy and goals.

You are under no obligation to proceed with treatment following the consultation. The consultation is a clinical assessment and information appointment, not a commitment to proceed. Core Aesthetics is at 12A Atherton Road, Oakleigh VIC 3166, open Tuesday to Saturday by appointment.

Book your consultation online here.

anti-wrinkle treatment planning at Core Aesthetics begins with understanding what is driving the concern, whether that is dynamic muscle activity, volume loss, or skin texture changes. The appropriate approach depends on this assessment, and treatment is only recommended when it is clinically indicated. Corey Anderson, Registered Nurse, conducts all assessments and treatments personally.