One of the most common concerns regarding Botox treatment is the fear that facial expressions may become unnatural.
In fact, many people have probably heard comments such as “your face becomes stiff after Botox” or “your forehead won’t move anymore.”
However, to begin with, Botox itself does not necessarily make facial expressions unnatural.
In most cases, when an appropriate dose and accurate injection points are used, natural facial expressions are well preserved.
Some patients even ask, “I had Botox, but why do my wrinkles still remain?”
So then, why do some people feel that their facial expressions become unnatural after Botox?
The first reason is inappropriate dosage selection.
When excessive amounts of Botox are injected solely with the intention of overly reducing wrinkles, the movement of the targeted muscles may become excessively restricted, leading to an unnatural appearance.
On the other hand, even a standardized dosage approach applied mechanically can also cause issues. For example, if insufficient units are injected into a patient who actually requires a higher dose, the muscles may respond with a compensatory over-contraction.
A representative example is cases where, after masseter Botox for jaw reduction, the treated area appears paradoxically more prominent, described as “as if holding a candy in the mouth.” This may occur due to insufficient total dosage or because the Botox was injected only into the deeper layers of the muscle, resulting in relatively stronger activity in the superficial muscle layers. A simple analogy would be how the biceps or triceps become visibly prominent when flexing the arm.
Such compensatory responses may also occur not only in the treated area but also in surrounding muscles.
For example, after glabellar (frown line) Botox, the outer part of the eyebrows—especially the brow tail—may elevate excessively, creating an angry facial expression. In Western countries, this is sometimes referred to as the “angry bird eyebrow.” In some East Asian contexts, it is also compared to the facial expression of a Japanese samurai and referred to as “samurai eyebrows.”
This phenomenon occurs when the glabellar muscles are not sufficiently balanced, and the lack of proper overall forehead equilibrium leads to compensatory overactivity in the lateral eyebrow region.
To prevent this, it is not always necessary to inject forehead Botox simultaneously with glabellar Botox. However, by considering forehead muscle dynamics and injecting a small preventive dose above the lateral brow area, such undesired compensatory movement can often be improved. This type of refined design helps prevent unnatural expressions such as “angry bird eyebrows.”
The second reason is issues with injection design and anatomical planning.
Botox is not simply a treatment where “you inject into the wrinkle area.” It is a procedure that requires understanding the structure and interaction of facial muscles.
Facial muscles do not function independently. Instead, multiple muscles interact and maintain balance to create facial expressions. Therefore, if one area is excessively relaxed in isolation, the overall facial balance may be disrupted.
For example, when treating glabellar wrinkles by targeting only a specific muscle without considering surrounding muscle activity, the directional force distribution may shift unexpectedly, resulting in unintended facial changes. From the patient’s perspective, this may be perceived as “the wrinkles improved, but my facial expression looks unnatural.”
In areas such as the forehead and around the eyes, which are closely interconnected, this phenomenon can be even more pronounced. When forehead movement is overly suppressed, compensatory overactivity may occur in adjacent muscles, leading to asymmetry. This is similar to how an entire structure becomes distorted when only one side is pulled.
Ultimately, even with the same dosage, if Botox is applied locally without considering overall facial balance, there is a higher likelihood of unintended expression changes.
The third reason is individual anatomical differences and muscle development.
Even though people share the same facial muscles, the thickness, force direction, skin thickness, and habitual facial expressions vary greatly from person to person. Therefore, identical treatment outcomes are difficult to achieve.
For example, in patients with well-developed masseter muscles, a standard dose of Botox may not provide sufficient relaxation, leading to the perception that the effect is weak or that the opposite side appears more prominent. Conversely, in patients with smaller muscle volume, the same dose may result in excessive effects, such as reduced chewing strength or a hollowed facial appearance.
Facial expression habits are also an important factor. Individuals who frequently raise their eyebrows or habitually frown will show different treatment outcomes even with identical injection sites. This is because the issue is not isolated to a single muscle but rather influenced by repeated facial movement patterns.
For this reason, Botox treatment should not be viewed as simply “injecting a fixed dose,” but rather as a customized design based on individual muscle structure and expression habits. Ultimately, even the same procedure can produce very different levels of natural results depending on how and to whom it is applied.
The fourth reason is differences in patient expectations.
Botox is often misunderstood as a procedure that completely freezes facial expressions or entirely eliminates wrinkles. However, in reality, it is a treatment that reduces excessive muscle activity and softens wrinkles naturally.
If this difference is not properly understood before treatment, patients may feel dissatisfied even when the medical outcome is appropriate. Some may feel that “the change is too subtle,” while others may feel that “my face became too stiff.”
For example, patients expecting complete elimination of glabellar lines may feel dissatisfied even with minimal residual movement, while those expecting a very natural result may perceive even slight changes as excessive stiffness.
Ultimately, the outcome of Botox is not determined by the absolute degree of change, but by how well it aligns with the patient’s expectations.
Therefore, Botox satisfaction is not determined by price, but by this.
To maintain consistent satisfaction, communication before and after treatment is extremely important.
If a patient has previous Botox experience, it is helpful not to simply describe it as “good” or “bad,” but to clearly explain which aspects were satisfactory and which were not.
For example, whether the effect was insufficient in a certain area or whether the facial expression felt overly restricted are important factors that guide dosage and injection point adjustments in the next session.
Botox is not a one-time procedure but a continuous process of refinement based on previous outcomes.
In addition, since each clinic may use different injection strategies and mixing methods, continuing treatment at the same medical institution can often be advantageous. Accumulated medical records allow for more precise adjustments in dosage, depth, and injection points.
The issue arises in environments where this kind of cumulative data-based adjustment is not sufficiently implemented.
For example, in so-called “factory-type clinics” with high patient turnover, detailed charting—such as how many units were injected at which points or how previous responses were documented—may not be consistently recorded or utilized.
(This is partly due to the fast-paced workflow, where physicians must immediately move on to the next patient after completing a procedure, leaving limited time for detailed electronic medical record documentation. This is also an unfortunate reality in aesthetic medicine in Korea.)
In such fast-paced systems, fine-tuned adjustments based on previous outcomes are inevitably limited.
Ultimately, the key factor is not the size of the clinic, but whether individual patient records are properly maintained and actively used to guide subsequent treatment design.
Furthermore, clinics where the treating physician is clearly designated and where doctors’ names, faces, and credentials are transparently disclosed may be more favorable. This is not simply a matter of trust, but because it allows continuous observation and cumulative refinement by the same physician.
Ultimately, what determines Botox satisfaction is not price or promotions, but whether the system allows previous treatment outcomes to be properly remembered and reflected in future procedures.
Confident Physicians vs. Physicians Working Within Real-World Clinical Constraints
In aesthetic medicine, treatment outcomes cannot always be explained solely by individual skill. Even with the same procedure, the consistency and refinement of results may vary depending on the clinical environment and how care is delivered.
Some physicians have extensive experience in specific procedures, allowing them to develop highly refined treatment designs and continuously refine their techniques based on accumulated clinical outcomes. In such cases, facial changes and patient responses are carefully observed over time, enabling ongoing improvement in treatment strategy.
On the other hand, in clinical settings where physicians manage a wide range of responsibilities and maintain a fast-paced workflow, the time available for each individual patient may be limited. While procedures are still performed safely and in a standardized manner, there may be practical limitations in achieving highly detailed personalization or long-term iterative refinement based on accumulated data.
Ultimately, the key factor is not simply “who the physician is,” but rather whether the clinical environment allows for continuous observation of patient outcomes and meaningful integration of previous treatment results into future procedures.
I personally view aesthetic medicine not as a one-time procedure, but as an ongoing process of observing patient changes over time and continuously refining outcomes through careful analysis and clinical experience.
Author’s note
This blog post is written directly by Dr. Lee Bo-won, CEO of DasiBomnal Clinic Sinchon Branch. (author of SCI-indexed journal publications.)
It is written during breaks between clinical duties, based on personal experience and clinical observations, so some sentences may not be perfectly refined, and minor grammatical or typographical errors may exist.
However, I have tried to convey commonly encountered clinical situations as clearly as possible, and I appreciate your understanding for any imperfections.
Medical information may vary depending on individual conditions, so this content is intended for general informational purposes only. Any medical decisions should be made after sufficient consultation with a qualified physician.
