Nerve signal
A nerve normally releases a chemical messenger called acetylcholine to signal a muscle to contract.
Medical Aesthetics · Educational Guide
What Is “Botox”?
“Botox” is commonly used as shorthand for wrinkle-relaxing injections. Botox® itself is a brand name for a preparation of botulinum toxin type A — a prescription-only medicine.
In aesthetic medicine, carefully selected doses can reduce specific muscle activity that contributes to dynamic facial lines. The effect is temporary and does not add volume to the face.
Important: This page is educational and does not advertise a prescription-only medicine. Any prescription treatment can only be considered following an appropriate clinical assessment and confirmation of medical suitability.
The basics
What is botulinum toxin?
Botulinum toxin is a neurotoxin protein. Purified, precisely dosed preparations of botulinum toxin type A have long been used in medicine for a range of conditions involving excessive muscle activity and, in some situations, gland activity.
In aesthetic practice, very small quantities may be placed into selected facial muscles to temporarily reduce their activity.
This can soften the appearance of lines created or accentuated by repeated facial expression.
What it is not
- It is not a dermal filler.
- It does not directly replace lost facial volume.
- It is not a facelift.
- It does not permanently stop a muscle working.
- It does not remove every type of facial line.
- It should not automatically eliminate all facial movement.
From nerve signal to softer movement
Facial expression depends on communication between nerves and muscles. Botulinum toxin temporarily alters part of that communication in the muscle being treated.
Targeted injection
A carefully measured amount is placed into selected muscle tissue following assessment of facial movement.
Reduced contraction
Release of the nerve messenger is temporarily reduced, so the targeted muscle contracts less strongly.
Dynamic lines soften
With less repeated folding of the overlying skin, expression-related lines can appear softer.
Dynamic lines vs static lines
Not every wrinkle is produced in the same way. This is one reason a facial assessment matters.
Dynamic lines
These appear or deepen when a muscle contracts — for example when you frown, squint, smile or raise your eyebrows.
Because muscle activity is an important part of their formation, these are the lines most directly influenced by a wrinkle-relaxing treatment.
Static lines
These remain visible when the face is at rest. They can reflect repeated movement over time together with changes in collagen, elasticity, sun exposure and facial structure.
Reducing muscle activity may soften some static lines, but established lines may also require time or a different skin-quality approach.
Does treatment have to make you look “frozen”?
No. Completely eliminating facial movement is not necessarily the objective.
A contemporary approach considers the balance between muscles, your facial anatomy, the strength of your expressions and how much movement you would personally like to retain.
At Santi, our preference is generally for a conservative, natural-looking result rather than treating every visible line simply because it exists.
Dose and placement can depend on:
- Your individual anatomy
- Muscle strength
- Facial asymmetry
- How your eyebrows move
- Previous treatment response
- The amount of movement you wish to preserve
- The clinical indication being considered
Areas commonly discussed in aesthetic consultation
Frown lines
Vertical “11” lines between the eyebrows associated with activity of the glabellar muscles.
Forehead
Horizontal lines associated with raising the eyebrows. Forehead and brow movement need to be assessed together.
Crow’s feet
Expression lines around the outer eye that become particularly visible during smiling and squinting.
Bunny lines
Fine expression lines that can appear across the upper sides of the nose.
Mouth corners
In selected cases, activity of the DAO muscles can contribute to a downward pull at the mouth corners.
Neck bands
Selected platysmal muscle activity may be assessed where prominent vertical neck bands are a concern.
Botulinum toxin also has medical uses
Botulinum toxin was used medically long before its widespread aesthetic use. Different medical indications require their own assessment, dosing and treatment protocols.
Jaw tension & bruxism
The masseter muscles may be assessed in selected patients with jaw clenching or bruxism.
Chronic migraine
Botulinum toxin type A can be used under specific medical protocols for selected patients with chronic migraine.
Hyperhidrosis
Reducing signalling to sweat glands can be useful in selected cases of excessive sweating.
What happens before any treatment is considered?
Step 1
Medical history
Your clinician reviews relevant medical conditions, medication, allergies, previous treatment and other factors that could affect suitability.
Step 2
Facial movement
You may be asked to frown, smile, squint and raise your eyebrows so that muscle strength and interaction can be assessed.
Step 3
Your objective
We discuss what actually bothers you and how much movement you want to retain rather than assuming that every line needs treatment.
Step 4
Suitability & prescription
Where a prescription-only treatment is being considered, it can only proceed when an appropriate prescriber has assessed you and confirmed that treatment is suitable.
When does the effect appear?
The change is not instantaneous. Individual response varies, so these timings are approximate.
Small pin-pricks, slight redness or tiny raised areas may be visible briefly.
A reduction in the strength of the targeted muscle movement may begin to become noticeable.
The treatment is generally assessed once the effect has had time to settle.
The effect is temporary. Muscle activity gradually returns as the treatment wears off.
Botulinum toxin vs dermal filler
Both are injectable treatments, but they do fundamentally different things.
| Botulinum toxin | Dermal filler | |
|---|---|---|
| Primary action | Temporarily reduces selected muscle activity | Adds or restores selected volume and structural support |
| Best known for | Dynamic expression lines | Volume, contour and selected folds or hollows |
| Adds volume? | No | Yes |
| Immediate effect? | No — develops over several days | Structural change is generally visible immediately, with swelling settling afterwards |
| Permanent? | No | No — longevity depends on product, area and individual |
| Learn more | Botox educational hub → | Dermal filler guide → |
Can treatment “prevent” wrinkles?
Repeated facial movement contributes to the formation of some expression lines. Reducing repeated contraction can therefore reduce the folding of the skin while the treatment is active.
That does not mean everyone should begin treatment at a particular age, nor does it guarantee that wrinkles will never develop.
Age is not the deciding factor
Muscle strength, facial anatomy, skin quality, sun exposure, genetics and personal preference are all more useful considerations than treating simply because someone has reached their twenties, thirties or forties.
For some people, skincare, SPF or a skin-quality treatment may be more relevant than a prescription injectable.
What are the possible side effects?
Common temporary effects
- Small injection-site marks
- Redness
- Mild swelling
- Bruising
- Tenderness
- Temporary headache in some people
Less common effects
- Temporary asymmetry
- Unwanted weakness in a neighbouring muscle
- Temporary brow or eyelid droop
- An unwanted change in expression
- Other medicine-specific adverse effects discussed during consultation
Who may not be suitable?
Medical assessment matters
Suitability is individual. Treatment may be inappropriate or need to be postponed depending on your medical history and circumstances.
Factors requiring particular consideration include:
- Pregnancy or breastfeeding
- Infection at a proposed injection site
- Certain neuromuscular disorders
- Relevant medication interactions
- Previous reactions to botulinum toxin preparations
- Other medical factors identified by the prescriber
Four things worth knowing
They are not. One alters selected muscle activity; the other principally provides volume or structural support.
No. Anatomy, muscle strength, indication and treatment goals vary considerably between individuals.
Not necessarily. Preserving appropriate expression can be an important part of treatment planning.
The effect is temporary. If you stop having treatment, muscle activity gradually returns towards its untreated state.
Frequently asked questions
Is Botox permanent?
No. The effect of botulinum toxin type A is temporary. Muscle activity gradually returns as the effect wears off.
How long does it last?
Duration varies according to the treatment area, dose, muscle activity, product and individual response. Aesthetic effects are commonly measured in months rather than years.
What happens if I stop having treatment?
The effect gradually wears off and activity returns to the treated muscles. Your face does not suddenly become worse because you have stopped treatment.
Will I look frozen?
That is not necessarily the objective. Dose and placement can be planned to reduce selected muscle activity while retaining appropriate facial expression.
Does it hurt?
A very fine needle is used and many people describe the sensation as a brief pin-prick. Sensitivity varies by person and treatment area.
When will I see the result?
Early changes may become noticeable within several days, with the effect generally assessed once it has settled at around two weeks.
Is Botox the same as Baby Botox?
“Baby Botox” is an informal term generally used to describe a conservative or lower-dose approach. It is not a different class of medicine. Dose and placement still need to be individually assessed.
Can botulinum toxin treat jaw clenching?
In selected patients, the masseter muscles can be assessed where bruxism or jaw clenching is a concern. This is different from treating upper-face expression lines and requires its own clinical assessment.
Can it be used for migraines?
Botulinum toxin type A has recognised medical use under specific protocols for selected patients with chronic migraine. Migraine treatment is a medical pathway rather than simply an extension of cosmetic forehead treatment.
Is this page advertising Botox?
No. This is educational information about botulinum toxin and aesthetic medicine. Botulinum toxin type A is a prescription-only medicine and any treatment decision requires an appropriate clinical assessment.
Santi's botulinum toxin guides
Santi London · South Kensington
Considering treatment for facial lines?
A consultation allows us to assess your facial movement, medical history and goals and explain whether a prescription treatment — or a different approach — is appropriate.
Educational information only. Botulinum toxin type A is a prescription-only medicine in the UK. Treatment can only be considered following an appropriate clinical assessment. Santi London · 33 Thurloe Street · South Kensington · London SW7 2LQ.