Nasolabial Fold Fillers: Can They Improve Smile Lines and Facial Creases?

Key Takeaways • Nasolabial folds, also called smile lines or nasal lines, are the creases running from the sides of the nose to the corners of the mouth. Everyone has them, but they deepen with age. • They are caused mainly by volume loss and sagging in the mid-cheek, bone changes around the nose, sun damage and repeated facial expression. • Hyaluronic acid filler can soften these folds, but the most natural results often come from restoring cheek support first and filling the fold itself only as needed. • The aim is to soften, not erase. A completely flat fold looks unnatural when you smile. • The area around the nose has important blood vessels, so treatment should only be done by a trained, credentialed doctor.

 

Look in the mirror and smile. The lines that run from the sides of your nose down to the corners of your mouth are your nasolabial folds. Many Malaysians call them nasal lines or smile lines, and in Chinese they are often called 法令纹 (fa ling wen).

Everyone has these folds. They are part of how a face moves. But as we get older, they can deepen into creases that remain even when the face is relaxed, making us look tired, stern or older than we feel. Nasolabial fold fillers are one of the most common ways to soften them. This guide explains why these lines form, how fillers work and what you can realistically expect.

What Are Nasolabial Folds (Smile Lines)? 

The nasolabial fold is the natural boundary where the cheek meets the area around the mouth. In younger faces, the cheek is full and sits high, so the fold is soft and shallow. Over time, the cheek loses volume and drops slightly, and the fold becomes deeper and longer.

It helps to separate two types of lines:

• Dynamic lines: Visible only when you smile or talk. These are normal and do not usually need treatment.
• Static folds: Visible even at rest. These are the lines most people want to soften.

What Causes Smile Lines to Deepen?  

Mid-Cheek Volume Loss 

The single biggest factor is usually the cheek, not the fold itself. As the fat pads of the mid-cheek shrink and descend, they bunch up against the fold and make it look deeper.

Bone Changes Around the Nose

The bone at the base of the nose, beside the nostrils, gradually recedes with age. Many Asian faces already have less projection in this area, which is why the upper part of the fold, right next to the nose, often deepens first in Malaysian patients.

Sun Exposure And Damage

Malaysia’s strong UV all year round breaks down collagen and elastin, which makes skin less able to bounce back from folding and creasing.

Repeated Facial Expressions

Smiling, laughing and talking fold the skin in the same place thousands of times a day. Over years, the crease becomes etched in.

Lifestyle and Weight Changes

Smoking, poor sleep, and significant weight loss or gain can all make folds more noticeable.

DOCTOR’S INSIGHT “Many of my patients who wear the tudung notice their smile lines earlier, because the face is framed closely and there is no hair at the sides to soften the area around the cheeks. They usually ask for the line itself to be filled. In most cases, what changes how the face looks inside the tudung is restoring some support at the cheek, so we start there.” Dr. Keerthana Shukdesh, Premier Clinic TTDI, Bangsar & Puchong

 

Should Nasolabial Fold Fillers Be Injected Directly Into Smile Lines?  

This is the most important question in treating smile lines, and the answer is often “not first”.

If filler is placed only in the fold while the cheek above has lost volume, the result can look heavy or puffy around the mouth, especially when smiling. Many experienced doctors use a step-by-step approach:

• Restore the cheek: A small amount of filler in the mid-cheek and outer cheek lifts the tissue that is pressing on the fold.
• Support the base of the nose: Filler placed deep near the bone beside the nostrils can soften the upper part of the fold.
• Fine-tune the fold: Only then is a softer filler placed in the fold itself, if still needed.

Not every patient needs all three steps. Some only need cheek support. Others, often those with good cheek volume but deep creases, benefit more from treatment directly in the fold.

DOCTOR’S INSIGHT “In many of my Malaysian patients, the deepest part of the fold is the top, right beside the nostril. That is often where the bone has receded, and it is very common in Asian faces. Placing a small amount deep at the base of the nose can soften that area more than adding filler further down the line, and it keeps the lower face from looking heavy.” Dr. Foo Wing Jian, Premier Clinic Mont Kiara

 

How Hyaluronic Acid Filler Works for Smile Lines 

Hyaluronic acid (HA) is a natural substance in the skin that holds water. HA filler is a gel form of this substance. When injected, it adds volume beneath the crease and supports the surrounding tissue so the fold looks softer.

HA filler is the most common choice for treating smile lines because:

• Results are visible immediately
• Different gel thicknesses can be used for different layers
• It integrates smoothly with the tissue when placed correctly
• It can be dissolved with an enzyme called hyaluronidase if needed

What to Expect During Nasolabial Fold Filler Treatment 

Consultation: Your doctor will look at your face at rest and while smiling, check cheek volume and skin quality, and ask about previous treatments and medical history.

Numbing: A numbing cream is applied, and most HA fillers contain a local anaesthetic.

Injection: Depending on the plan, filler is placed in the cheek, at the base of the nose and in the fold using a fine needle, a blunt cannula or both. The procedure usually takes 20 to 40 minutes.

Immediately after: You may have mild swelling, redness and small bruises. Most people go back to work the same or next day.

Review: A follow-up at around two weeks lets your doctor check the result once swelling has settled.

Aftercare Tips 

• Avoid strenuous exercise, saunas and hot yoga for 24 to 48 hours
• Avoid massaging or pressing the treated area unless told to
• Avoid alcohol for the first day, as it can increase swelling and bruising
• Sleep with your head slightly raised on the first night if swelling bothers you

OUR PATIENT’S EXPERIENCE  I notice the lines from my nose to my mouth in every family photo, even when I am not smiling, and my relatives say I look fierce. I had filler in the mid-cheek with a smaller amount near the nose, around 2ml in total. For the first week the area felt slightly firm when I smiled widely, and there was mild swelling for a couple of days. The lines still show when I laugh, but they look shallower at rest. Madam Lee YS, 45

 

Nasolabial Fold Filler Results: How Long Do They Last? 

Nasolabial fold fillers usually give an immediate softening of the crease, with the final result clear at around two weeks. Most patients find that results last around 9 to 12 months in the fold itself, and longer for filler placed deep in the cheek.

It is worth setting realistic goals:

• Soften, not erase: A completely flat fold looks unnatural, especially when smiling. A good result usually softens the fold rather than removing it.
• Expression still matters: People who smile and talk a lot will still have lines when they are animated. That is normal.
• Maintenance is needed: HA filler breaks down gradually, so top-ups are usually needed every 9 to 18 months depending on the areas treated.

DOCTOR’S INSIGHT “I tell patients to expect the fold to look about half as deep, not gone. The patients who are happiest long term are the ones who still look like themselves when they laugh. When someone asks me to remove the line completely, we talk about how it will look in conversation, not just in a still photo.” Dr. Tarina Sandara, Premier Clinic Puchong & KL City

 

Are Nasolabial Fold Fillers Safe? Risks and Precautions 

The area around the nose and the nasolabial fold contains important blood vessels, including the facial artery and its branches. If filler is injected into or presses on a blood vessel, it can block blood flow to the skin. This is rare, but it is serious and needs immediate treatment.

To lower risk:

• Choose a doctor who holds a Letter of Credentialing and Privileging (LCP) from the Ministry of Health for aesthetic procedures
• Make sure the filler used is a product registered with the Medical Device Authority
• Ask whether the clinic keeps hyaluronidase on site, so it can be used immediately if a problem occurs
• Report severe pain, unusual whitening, or dusky or blotchy skin after treatment straight away

OUR PATIENT’S EXPERIENCE  I meet clients every day and my smile lines make me look tired even after a long weekend. I did not want anything that looks done, so I had around 1ml in total, mostly at the cheek. It was tender for a couple of days, with hardly any bruising. Colleagues have not commented, and I did not want them to. Mr Rajan, 50

 

What Are the Alternatives to Fillers for Smile Lines? 

Fillers are not the only approach, and they work best as part of a wider plan.

• Skin boosters: Injectables such as Profhilo and other skin boosters improve skin hydration and quality, which can soften fine lines around the folds.
• Lifting and tightening: Ultherapy and other energy-based treatments can help when sagging, rather than volume loss, is the main cause.
• Thread lift: Lifting threads can reposition the mid-cheek in suitable patients.
• Sun protection and skincare: Daily sunscreen and retinoids help protect collagen and slow further deepening.

Final Thoughts: Can Fillers Effectively Soften Smile Lines? 

Nasolabial fold fillers can make a real difference to how rested and approachable a face looks. The best results usually come from treating the cause, often the cheek and the base of the nose, rather than just filling the line itself. A conservative approach, a doctor who understands facial anatomy and realistic expectations go a long way.

If smile lines are bothering you, the doctors at Premier Clinic can assess what is driving them in your face and recommend a plan that keeps your natural expression intact.

Frequently Asked Questions

How long do nasolabial fold fillers last? 

Most patients see results lasting around 9 to 12 months in the fold itself. Filler placed deeper in the cheek often lasts longer, up to around 18 months. How long it lasts depends on the product, the amount used, your metabolism and how expressive your face is.

Are nasal lines filler injections painful?

Most patients describe mild discomfort rather than pain. A numbing cream is applied beforehand, and most HA fillers contain a local anaesthetic that takes effect during the treatment.

Will nasolabial fold fillers make my smile look unnatural? 

Not if the filler is placed in the right layers and in sensible amounts. Unnatural results usually come from overfilling the fold directly. Restoring cheek support and aiming to soften rather than erase the line helps keep your smile natural.

Can hyaluronic acid for smile lines be reversed? 

Yes. HA filler can be dissolved with an enzyme called hyaluronidase, usually within a day or two. This is one of the main reasons HA is preferred for this area.

Is treating smile lines with Botox an option?

Not usually. Botox relaxes muscles and is used for lines such as frown lines and crow’s feet. Using it around the mouth to soften smile lines can affect your smile and speech, so fillers or lifting treatments are generally more suitable.

How long does swelling last after smile line filler treatment? 

Mild swelling and bruising commonly improve within several days, although some patients take longer to recover. The treated area may initially feel tender or firm. Seek urgent medical attention if you experience severe or increasing pain, unusual skin discolouration or visual changes.