Corner of the Mouth Botox Effects: Does It Really Change Your Impression? From Principles to Limitations

Mouth corner Botox is a treatment that weakens the strength of the muscles that pull downward (depressor anguli oris, DAO) instead of those that lift the drooping mouth corners up, making the corners of the mouth appear relatively elevated. Instead of incising muscles or touching bone, it is a method where botulinum toxin temporarily rests the contraction of specific muscles. Consequently, the procedure time is short at about 5 to 10 minutes, and there is almost no recovery period.

The effects usually appear gradually 3 to 7 days after the procedure, with the maximum effect confirmed after 1 to 2 weeks. The average maintenance duration is 3 to 4 months. It is particularly well-suited for softening an impression that looks angry or pouty when expressionless. However, if the cause of the drooping mouth corners is skin sagging or volume loss rather than muscle, there is a limit with Botox alone. Therefore, it is important to first identify the cause.

🔍 How exactly does mouth corner Botox work?

Around our mouth, there are muscles that move in opposite directions. These are the levator anguli oris, which raises the corners of the mouth, and the depressor anguli oris (DAO), which pulls the corners of the mouth downward.

As we age or if facial habits become ingrained, the DAO can become hyperactive, constantly pulling the corners of the mouth down. As a result, they look droopy even when still, and an expressionless face can feel cold.

At this point, if botulinum toxin is precisely injected into the DAO, acetylcholine release at the neuromuscular junction is inhibited, temporarily halting muscle contraction. Since the downward pulling force is weakened, the lifting muscles gain relative dominance, naturally making the corners of the mouth look elevated.

The key is the location and depth. Because the orbicularis oris, which is involved in pronunciation, eating, and facial expressions, is densely interwoven around the mouth, even a slight inaccuracy can affect unintended muscles. This is why hands familiar with facial anatomy are necessary.

📌 Key Summary: Mouth corner Botox is a treatment that relatively elevates the corners of the mouth by weakening the strength of the muscles pulling downward (DAO), and precise injection placement determines the outcome.

⏱️ When do the effects appear, and how long do they last?

This is the part most people are curious about. I've summarized it in a table first.

It is correct to judge the effect at least 1 to 2 weeks later. There is no need to be impatient right after the procedure thinking 'it hasn't changed much.' If you feel it is lacking, a touch-up is possible to inject a small additional amount at the check-up point 1 to 2 weeks later.

One reassuring point is that the effect of Botox is reversible. Over time, muscle function naturally returns, and even if you are not satisfied, it will not become worse than before the procedure. For first-timers, this 'reversibility' actually relieves their burden.

Interestingly, repeated procedures clinically show a tendency to gradually increase the maintenance duration as the muscle usage habit itself decreases. Of course, individual differences exist.

📌 Key Summary: The effect begins starting from 3 to 7 days, reaching its peak in 1 to 2 weeks, and lasts an average of 3 to 4 months. Because it is reversible, it will recover naturally even if you are not satisfied.

🚫 Are there cases where mouth corner Botox is ineffective?

Yes, definitely. Keeping this in mind honestly is the way to reduce disappointment.

There isn't just one reason why the corners of the mouth droop. If muscle hyperactivity is the cause, Botox works well, but in the cases below, the standalone effect is limited.

• Decreased skin elasticity and sagging tissue: These fall under the domain of lifting procedures like thread lifting, ultrasound HIFU, or radiofrequency RF.

• Volume loss and marionette lines (deep wrinkles below the mouth corners): Improvement requires filling the sunken areas with marionette filler.

• The shape itself in a static state (expressionless): It is more advantageous to define the line with mouth corner fillers.

• Skeletal asymmetry and dental malocclusion issues: Fundamental resolution is difficult with muscle adjustment alone.

Mouth corner fillers fix the shape when expressionless, while Botox improves the impression when moving. Since the principles are different, combining the two creates synergy. If drooping tissue is the cause, lifting-type procedures are considered together. Ultimately, diagnosing 'what caused the drooping' is the first step.

📌 Key Summary: If the cause of drooping mouth corners is skin sagging, volume loss, or skeletal issues, Botox alone has limitations, making combinations with fillers or lifting necessary.

💋 Why is it better to combine it with a lip lift?

Let's take a step further here. In fact, just looking at the corners of the mouth alone often does not significantly change the overall impression.

The conditions for a youthful impression are concentrated around the lips. A philtrum that appears short, plump lips, and naturally elevated mouth corners. When these three are met together, the center of the face is arranged, completing a youthful-looking impression. Conversely, a lengthened philtrum, thin lips, and drooping mouth corners are read as representative signs of aging.

Therefore, Onlif Clinic does not view mouth corner Botox as a standalone treatment, but approaches it from the perspective of a 'lip lift' designed together with lip filler + philtrum Botox.

• Lip Filler: Giving volume and defining the line on the upper lip visually shortens the philtrum and balances facial proportions.

• Philtrum Botox: Precisely adjusts the philtrum muscles to organize the lip line and asymmetry.

• Mouth Corner Botox: Releases the downward pulling force to create a soft impression even when expressionless.

The ideal ratio is often talked about as philtrum : upper lip : lower lip = 1 : 1 : 1. Filling only volume looks awkward, and defining only the line is insufficient. Thus, simultaneously designing the balance of lips, philtrum, and mouth corners is the key. The procedure time is about 10 to 15 minutes, including consultation and design, and is carried out after sufficiently applying anesthetic cream.

Onlif does not aim for a direction that alters the shapes of eyes, nose, and mouth, but pursues a non-surgical approach that naturally removes the sagging and lack of volume that obscured your inherent impression. The philosophy "Because you are precious, we do not change you" lies here.

📌 Key Summary: Instead of looking only at the mouth corners, a lip lift (lip filler + philtrum Botox) designed to balance the philtrum, lips, and mouth corners is more effective for a youthful impression.

⚠️ Side effects and precautions, know them in advance

Just because it is non-invasive does not mean there's nothing to worry about.

If the location is inaccurate or the dosage is excessive, functional inconveniences can occur, such as asymmetry when smiling, awkward pronunciation, spilling drinks, or one corner of the mouth going up excessively. Most cases recover naturally as the effect wears off, but it is best not to create these situations in the first place.

These are things to keep in mind before and after the procedure.

• Before the procedure: Ingredients that inhibit blood coagulation, such as aspirin, anticoagulants, omega-3, and vitamin E, can increase the risk of bruising, so please consult in advance.

• After the procedure: Avoid lying down for 4 to 6 hours, do not massage or press the treated area, and avoid drinking alcohol, saunas, and strenuous exercise on the same day.

• During pregnancy/breastfeeding: This procedure is contraindicated due to insufficient safety evidence.

We also need to address the products. Because botulinum toxins have different potency (Unit) conversion ratios depending on products like Onabotulinum, Abobotulinum, Incobotulinum, etc., units cannot be simply compared. This means comparing numbers like 'how many units at hospital A vs. how many units at hospital B' can be meaningless. Therefore, dosage design that reflects product characteristics and authenticity is important.

Lastly, resistance. While it is rare for neutralizing antibodies (resistance) to form in small-dose procedures for cosmetic purposes, the risk rises if repeated too frequently or at high doses. Keeping appropriate intervals is safe.

Onlif operates in a way where each practitioner takes charge of the procedure they do best in their respective field. Hands familiar with facial anatomy and genuine products, these two are the foundations of safety.

📌 Key Summary: Incorrect location or dosage can cause discomfort in facial expressions, units cannot be compared across products, and the procedure is contraindicated during pregnancy or breastfeeding.

💰 What is the cost?

The cost of mouth corner Botox is set at around 30,000 to 160,000 KRW (VAT excluded) depending on the clinic and the product used. The wide range is due to different product lines, dosages, and treatment scopes.

However, as mentioned earlier, rather than judging by price alone, it is wise to consider the authenticity of the product, the practitioner's skill level, and whether the design matches your cause of sagging together. In cases like a lip lift where filler and Botox are configured together, costs per item will vary, so confirming during a consultation is most accurate.

📌 Key Summary: Mouth corner Botox is around 30,000 to 160,000 KRW, and it is better to consider authenticity, expertise, and cause-customized design over price alone.

❓ Frequently Asked Questions (FAQ)

When do the effects of mouth corner Botox appear and how long do they last?

Typically, the effects begin 3 to 7 days after the procedure and peak in 1 to 2 weeks. The average maintenance duration is 3 to 4 months, and this can vary from 2 to 6 months depending on the individual.

Which is right for me, mouth corner Botox or mouth corner filler?

Botox improves movement when making facial expressions, and filler shapes and adds volume when expressionless. If the cause is muscle hyperactivity, Botox is advantageous; if it is volume loss, filler is better, and combining both creates synergy. Precise determination requires identifying the cause in a consultation.

Can my facial expression look awkward when smiling after the procedure?

If the location is inaccurate or the dosage is excessive, asymmetry when smiling or pronunciation difficulties can arise. Most cases naturally recover as the effect wears off, but to reduce this risk, it is important to receive it precisely from somewhere familiar with facial anatomy.

How can I know if the drooping mouth corner is due to muscle or skin?

Compare your expressionless face and your smile; if the improvement is significant when moving, it is highly likely a muscle cause. Sagging skin/tissue, volume loss, or skeletal factors have limits with Botox alone, so fillers or lifting are considered together. Distinguishing the cause is most accurate through diagnostic consultation.

Can I get just lip fillers, or is it better to get them together as a lip lift?

A standalone lip filler procedure is possible. However, because the mouth area has significant muscle movement, approaching it as a lip lift that includes philtrum and mouth corner Botox balances the philtrum, lips, and mouth corners, allowing you to expect a more natural, youthful impression.

Does repeated treatment cause resistance?

Developing neutralizing antibodies (resistance) is rare in small cosmetic procedures. However, because the risk can increase if repeated too frequently or at high doses, it is recommended to keep appropriate intervals.

Can I receive the procedure if I am pregnant or breastfeeding?

During pregnancy or breastfeeding, this procedure is not recommended due to insufficient safety evidence of botulinum toxin. This is an item you must inform us of before the consultation.