Emotions and injections in aesthetic medicine
Fear of losing one's emotions after an aesthetic medical procedure is common, legitimate and deeply human. In Geneva and elsewhere, many patients wonder about the actual impact of hyaluronic acid and botulinum toxin injections on facial expressiveness, spontaneous smiling and the ability to show joy, anger or sadness. This concern is often fuelled by caricatured media images, isolated accounts or poorly performed treatments.
This article aims to explain precisely what these injections do, what they do not do and under what conditions they fully respect the face's emotions and identity.
What are facial emotions?
Human emotions are complex phenomena originating in the brain, more specifically in deep structures such as the limbic system. They are then expressed through the face via facial expression muscles, facial nerves and the skin.
The human face has more than 40 muscles involved in expression. These muscles enable extremely subtle, coordinated movements. Emotions are therefore located not in the skin or wrinkles but in the brain. Wrinkles are the mechanical consequence, over the years, of repeating certain expressions.
It is therefore essential to understand that neither hyaluronic acid nor botulinum toxin acts on the brain, emotions themselves or the ability to feel.
Effects of botulinum toxin on emotions
Botulinum toxin has been used in medicine for several decades, long before its use in aesthetic medicine, particularly in neurology and ophthalmology. In aesthetics, very low doses are injected into specific muscles.
Its mechanism is well understood: it temporarily blocks transmission of the nerve signal between nerve and muscle. The muscle contracts less, or not at all, for a few months.
What you should know about botulinum toxin
Botulinum toxin does not numb the face.
It does not paralyse the entire face.
It acts only on targeted muscles. When injections are performed correctly, only muscles responsible for certain excessive expression lines are modulated. Other muscles involved in overall emotional expression remain active.
Its effect is reversible.
Why do some people look “frozen” after botulinum toxin injections?
The frozen or expressionless faces sometimes seen are not an inevitable consequence of injections but the result of inappropriate practices.
The main causes are:
• Excessive botulinum toxin doses.
• Poor choice of injected muscles.
• Lack of treatment personalisation.
• Seeking an immobile face rather than a natural one.
Poorly performed treatment can look artificial or even impair non-verbal communication. Conversely, a considered medical approach aims to preserve slight movement, sufficient to maintain expressiveness while softening wrinkles.
Hyaluronic acid and its impact on facial expressions
Hyaluronic acid is a molecule naturally present in the human body. In aesthetic medicine, it is used as an injectable gel to restore volumes, fill certain wrinkles or improve deep skin hydration.
Unlike botulinum toxin, hyaluronic acid does not act on muscles. It blocks no nerves, does not interfere with muscle contraction and has no direct effect on facial movement.
Its role is essentially structural: supporting tissues, restoring age-related volume loss, improving skin quality and lifting sagging tissues (medical facelift technique).
When injected incorrectly or in excessive quantities, it can make the face heavier and less dynamic. Here too, this is a technical problem.
Facial feedback theory
Several studies have explored the link between botulinum toxin, facial expression and emotions. Some research suggests that reducing certain facial expressions could slightly modulate emotional perception, particularly within facial feedback theory.
However, these effects are subtle, temporary and highly dose-dependent. They have nothing to do with losing emotions or altering personality.
In everyday clinical practice, correctly treated patients continue to laugh spontaneously; express joy, surprise and sadness; and communicate normally with those around them.
Most people instead describe improved wellbeing, associated with a more rested appearance that better reflects how they feel inside.
Can a completely natural appearance be preserved after injections?
The answer is clearly yes, provided certain fundamental principles are respected.
Well-performed treatment must: preserve natural facial movement; avoid excessive corrections; respect key areas of emotional expression; and be gradual and reassessed over time.
Modern aesthetic medical procedures no longer seek to erase every wrinkle, but to support harmonious ageing. Wrinkles are part of a face's story, but some can be softened without erasing its soul.
How to preserve your emotions while benefiting from injections
The goal of aesthetic treatment is not to remove all expressiveness but to restore a face consistent with the person's identity and history. Personalisation is central: selecting areas, doses, hyaluronic acid type and botulinum toxin injection pattern according to each face's individual dynamics.
Several elements help fully preserve emotions:
- Thorough assessment of facial expressions before any procedure, observing the face moving and at rest, and how the patient smiles, speaks, concentrates or shows surprise.
- Measured, gradual injections, with deliberately adjusted doses and the possibility of later minor touch-ups, rather than maximal treatment in a single session. This approach guarantees a more natural result.
- Meticulous respect for the muscles involved in smiling and positive expressions, avoiding any excessive correction that could impair facial spontaneity and warmth.
- Incorporating the face's emotional dimension into the overall treatment strategy, using structured approaches to soften certain involuntary facial messages, such as a stern, sad or tired appearance, while preserving the patient's expressive richness and personality.
- Detailed discussion before the session also clarifies what the patient fears: a frozen face, no longer recognising themselves or being unable to express a strong emotion. The treatment strategy can then be adapted to reassure them and respect these priorities.
What do patients actually feel after treatment?
Qualitative studies and satisfaction questionnaires show that most patients describe improved self-confidence, a greater desire to connect with others and a sense of consistency between what they feel and what they show after hyaluronic acid injections.
For botulinum toxin, patients often describe a more relaxed, less “closed” or less stern appearance, and some report a subjective sense of improved emotional wellbeing.
There are of course individual variations: some prefer very subtle results, while others accept a greater reduction in certain expressions to erase more wrinkles. The essential point is that these choices are anticipated and shared, preserving the person's emotional identity.
The importance of a personalised medical diagnosis
Every face is unique. It has its own anatomy, muscle dynamics, history and way of expressing emotions. This is why standardised treatment is incompatible with a quality aesthetic medical procedure.
A rigorous medical diagnosis includes: static assessment of the face at rest; dynamic assessment during movement; listening to the patient's emotional expectations; and respect for age, sex and personality.
In Geneva, where patients predominantly seek subtle, elegant results, this personalised approach is essential.
