Lip Fillers Singapore
Definition, hydration or modest volume, planned from your face rather than a syringe count. Medical Director Dr Sin Yong plans each treatment at IN Eternity Clinic, and a doctor injects.
WhatsApp to Enquire →Key facts ↓Lip fillers in Singapore are small amounts of soft hyaluronic acid injected to define the lip border, improve hydration, balance the two lips or add modest volume. The plan starts from your facial proportions, and first treatments are kept modest. Swelling settles over about a week. Results often last around six to twelve months, and hyaluronic acid can be dissolved if needed.
Lip fillers at a glance
| Question | Lip fillers |
|---|---|
| What it is | Small amounts of soft hyaluronic acid gel placed in or along the lips by a doctor. |
| Used for | Border definition, hydration, balancing the two lips and modest volume. Not a lip that disappears on smiling (a lip flip) or lip colour. |
| How it works | Gel along the border defines the outline, small amounts in the body add fullness, and fine threads under the surface hydrate, by fine needle or blunt cannula. |
| Typical sessions | A modest first treatment, reviewed two to four weeks later when any refinement is planned; reviewed again every six to twelve months as needed. |
| Downtime | Swelling peaks over two to three days and settles in about a week, sometimes two; bruising is possible. |
| When results show | The shape shows straight away; the settled result after about two weeks; it often lasts around six to twelve months. |
| Who should avoid or wait | Pregnancy and breastfeeding, an active cold sore or infection, and dental work around the time; recurrent lip swelling, autoimmune conditions or previous filler reactions are assessed first. |
| Who performs it | Dr Sin Yong performs injectable treatments himself. |
Dr Sin Yong, Medical Director of IN Eternity Clinic, explains that lips look done when the border disappears, so he keeps the border crisp and the amounts modest: a natural lip is a proportion, not a size.
On this page
- What it is: soft hyaluronic acid gel placed in or along the lips by a doctor.
- Used for: border definition, hydration, symmetry and modest volume.
- Not used for: a lip that disappears on smiling (lip flip), lip colour (pigmentation treatment) or deep smoker’s lines alone.
- Reversibility: hyaluronic acid can be dissolved with hyaluronidase; collagen stimulators are not used in the lips.
- Recovery: swelling peaks over two to three days and settles in about a week.
- Duration: often around six to twelve months, varying between people and products.
- Consultation: S$120, waived with any medical treatment. IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza.
What can lip fillers do, and what can they not?
Lip fillers are small amounts of soft hyaluronic acid gel placed in or along the lips, injected by a doctor. They are used for several different jobs, and the job decides the amount and where it goes:
- Shape and definition: a clearer vermilion border (the edge of the lip) and Cupid’s bow, so the lip outline reads crisply without lip liner.
- Hydration: very soft gel in fine threads to improve dryness, texture and fine vertical lines without visibly adding size.
- Modest volume: a little more fullness in thin or age-thinned lips, kept in proportion with the nose and chin.
- Balance: evening out differences between the two sides, or between the upper and lower lip.
- Support for the mouth corners: softening a downturned corner as part of a wider plan.
Fillers do not lift a lip that disappears when you smile; that is a muscle effect treated with a lip flip. They do not change lip colour, which is addressed by lip pigmentation treatment or lip blush. And they do not reverse heavy smoker’s lines on their own; those need the skin around the mouth treated as well. Lip filler is one area among many covered on dermal fillers Singapore.
Natural lip proportions: why a lip filler plan starts from the face
A lip that suits one face can look wrong on another, so the plan starts with proportion rather than a syringe count. Studies of lip attractiveness consistently prefer a lower lip somewhat fuller than the upper, a defined border and lips that sit in balance with the nose and chin in profile. Consensus work on Asian facial aesthetics describes a preference for soft, well-defined lips that support the profile rather than dominate it.
| What is assessed | Why it matters |
|---|---|
| Upper-to-lower lip balance | An upper lip fuller than the lower tends to look unnatural, especially in profile |
| Border and Cupid’s bow | A crisp border gives definition with little volume; a blurred border is a common sign of overfilling |
| Lip projection in profile | Judged against the nose and chin; sometimes the chin is the real issue, not the lips |
| Width and mouth corners | Fullness should taper towards the corners; filling them bulks the mouth |
| Teeth and gum show | A gummy smile or lip that rolls in changes what filler can achieve |
| Skin around the mouth | Fine lines and thin skin above the lip need their own treatment |
When the chin is recessed, the lips can look too prominent whatever is done to them; supporting the chin with chin fillers sometimes balances the profile better than adding to the lips.
Which filler is used for lips, and how is it placed?
Lips are treated with soft, flexible hyaluronic acid gels designed to move with speech and expression. Hyaluronic acid can be dissolved with hyaluronidase if needed, which matters in an area this visible. Collagen-stimulating products such as CaHA, PCL and PLLA are not used in the lips, because of the risk of firm nodules in a mobile area.
Placement follows the job. Product along the border defines the outline; small amounts in the body of the lip add gentle fullness; fine threads just under the surface hydrate. A fine needle or a blunt cannula may be used, chosen for the area and the anatomy. The labial arteries run within the lips, usually deep to the muscle on the inner side, so depth and technique are planned around them, injection is slow, and amounts are small.
First treatments are deliberately modest. Lips swell for several days, so the true result is judged at review, two to four weeks later, and any further refinement is planned then. Staging gives a natural result and a chance to stop when it looks right.
“Lips look done when the border disappears. Keep the border, and most people will only notice that you look well.”
Lip filler swelling and recovery: what to expect day by day
| When | What is usual | What helps |
|---|---|---|
| Day 0 | Lips look fuller than the final result; tenderness, small injection marks | Cold compress; no lip products for a few hours |
| Days 1–3 | Swelling peaks, often more in the morning; bruising possible | Sleep slightly propped up; avoid hot drinks, alcohol, exercise and saunas |
| Days 4–7 | Swelling settles; small firm areas soften | Avoid pressing or massaging unless advised |
| Weeks 2–4 | Settled shape; review | Refinement planned at review, not before |
Hyaluronic acid in the lips is broken down faster than in quieter areas because the lips move constantly; results often last around six to twelve months, varying between people and products. Some product may remain longer than it looks, which is one reason repeated touch-ups without review can gradually blur the border. Where each part of the lip is treated, and why lips become overdone, is set out in lip filler placement by zone, further down this page.
How are lip fillers done, step by step?
A lip filler visit is mostly assessment and planning; the injecting itself is done in small amounts.
- Assessment with Dr Sin Yong: lip proportion at rest and smiling, the profile, the border, the skin above the lip, and any cold sores, dental plans or earlier filler.
- Preparation: make-up is removed, photographs are taken and numbing cream is applied; preventive cold-sore treatment is prescribed where needed.
- The injections: small amounts are placed by zone, along the border, in the body of the lip or as fine hydrating threads, with a fine needle or blunt cannula; first treatments are kept modest.
- Straight after: shape and colour are checked and ice helps with tenderness.
- The next days: swelling peaks over two to three days; avoid firm pursing, straws and kissing for a day or two, and do not massage unless advised.
- Review: at two to four weeks, once swelling has settled, any refinement is planned.
How many lip filler sessions are needed?
Most people start with one modest treatment and decide on any refinement at the review.
| Stage | When | Purpose |
|---|---|---|
| First treatment | Day 0 | Kept modest; swelling hides the result at first |
| Review | Two to four weeks later | Any refinement is planned once the lips have settled |
| Later review | Every six to twelve months, as needed | A fresh assessment, not a routine repeat |
Are lip fillers safe? Risks and how they are reduced
Bruising, swelling and tenderness are common and settle. The less common problems are worth knowing:
- Vascular occlusion: filler blocking a branch of the labial artery. Signs are severe pain, pale or dusky, mottled skin on the lip or above it. Hyaluronidase is kept on site and used at once if this is suspected.
- Cold sores: injection can trigger a flare in people who get them. Tell the doctor if you have had cold sores; preventive treatment may be prescribed, and treatment is postponed during an active sore.
- Lumps and migration: small firm areas usually soften. Product that drifts above the border, a “filler moustache”, usually follows repeated or excessive treatment and can be corrected with hyaluronidase.
- Infection and delayed reactions: uncommon; redness, warmth or swelling days or weeks later needs review.
Products should be HSA-registered and come from authorised supply. If a previous result looks wrong, it is assessed first, often with ultrasound, before anything is added; see filler correction. Lip enhancement focused on hydration and fine lip lines is covered under lip rejuvenation for hydration and lip lines.
What Dr Sin Yong looks for
- Lip proportion at rest and smiling. Upper-to-lower balance, border definition and how the lips change when you smile.
- The profile. Lips are judged against the nose and chin before any volume is added.
- The border. A blurred or raised border suggests earlier product or overfilling.
- Skin above the lip. Fine lines, thin skin or pigment point to treatment of the skin as well as, or instead of, the lip.
- Gum show and lip roll. A lip that disappears on smiling may need a lip flip rather than filler.
- History. Cold sores, dental work planned in the next weeks, previous filler and any reactions.
General clinical observations used at consultation; they describe what is checked, not any individual result.
Lip fillers Singapore price: what decides it
Lip filler price depends on the amount of product needed (often less than one syringe for a first, modest treatment), the product, whether the plan is staged, and what review is included. A hydration treatment, a border refinement and a volume plan are priced differently. IN Eternity Clinic gives a written quote after assessment; the consultation fee is S$120, waived with any medical treatment.
For a market reference, this is what other Singapore clinics publish for lip filler on their own price pages.
| Treatment variant | Published range | Number of clinics | Sources |
|---|---|---|---|
| Lip filler, per syringe or per area | S$700–S$1,100 (includes “from” prices) | 4 | Lux Medical Aesthetic Clinic, SL Aesthetic Clinic, Illumia Medical Aesthetics, David Loh Aesthetics read 20 Oct 2026 |
Price lines as published (4 lines)
- Lux Medical Aesthetic Clinic: “LIP FILLER $700* PER SYRINGE” (per syringe, before GST). luxaestheticclinic.com/price-list, read 20 Oct 2026.
- SL Aesthetic Clinic: “Lip Filler For temporary enhancements of the lips. From $700” (from). slclinic.com.sg/price-list, read 20 Oct 2026.
- Illumia Medical Aesthetics: “illumia Lip Filler From $1,100” (from). illumiamedical.com/price-list, read 20 Oct 2026.
- David Loh Aesthetics: “Dermal fillers for the Nose or Lips Per area 800” (per area, before GST). davidloh.sg/price-list, read 20 Oct 2026.
Ranges for other areas are in filler price Singapore.
When a lip concern is not cosmetic
Most lip concerns are about shape or ageing. A few signs need a doctor before any filler.
- A sore, crust or scaly patch on the lip that does not heal in a few weeks, or bleeds: this is examined, as sun damage on the lower lip can become a skin cancer.
- Swelling of the lips that comes and goes, with or without hives: this can be angioedema and needs assessment, urgently if breathing or swallowing is affected.
- An active cold sore or mouth infection: treatment is postponed until it has healed.
- New numbness or one-sided weakness of the lips: this is a nerve symptom and needs medical assessment.
- Pain and colour change after filler: pale, dusky or mottled skin is an emergency.
Where any of these apply, a diagnosis comes first.
Lip filler placement by zone: Cupid’s bow, philtrum and projection points
A lip is not filled as one unit. Small amounts go into different parts of it, and each part changes something different, which is why a lip plan is described by zone rather than by syringe. Beyond the border and the body of the lip, three smaller zones decide much of the shape.
| Zone | What it changes | What to watch |
|---|---|---|
| Cupid’s bow | The shape of the centre of the upper lip | Filling across it flattens the bow and makes the lip look generic |
| Philtrum columns | The two ridges between the nose and the upper lip | Often left alone; adding here can make the upper lip look longer |
| Glogau-Klein points | Forward projection at the peaks of the upper lip | Very small amounts change the profile quickly |
Natural results keep the upper lip slightly smaller than the lower, respect the border and preserve the Cupid’s bow. Overdone results usually come from three things: too much volume at once, product in the wrong plane, and volume that has built up over several sessions because earlier filler was still there. Lips move constantly, so hyaluronic acid is broken down faster here than in quieter areas, yet some product often remains longer than it looks. That is why each treatment starts with a fresh assessment rather than a repeat of the last one.
Many hyaluronic acid lip fillers are mixed with a local anaesthetic, and numbing cream is applied beforehand, so most people feel pressure and brief stings rather than sustained pain. If you are thinking about an alternative that adds no volume, the lip flip relaxes the muscle instead.
As Dr Sin Yong puts it: “A natural lip is a proportion, not a size.”
- How long lips respond: a meta-analysis of hyaluronic acid lip augmentation found 91 per cent of people still responding two months after injection, 74 per cent at six months and 46 per cent at 12 months. (Czumbel et al., Front Surg 2021)
- Common effects: across 1,496 participants, the most frequent treatment-related effects were tenderness (88.8 per cent), injection-site swelling (74.3 per cent) and bruising (39.5 per cent). (Czumbel et al., Front Surg 2021)
- Rare effects: in the same meta-analysis, foreign body granulomas (0.6 per cent), cold sores (0.6 per cent) and angioedema (0.3 per cent) were rare. (Czumbel et al., Front Surg 2021)
- Where occlusion happens: in a survey of 370 dermatologists covering about 1.7 million syringes, the nasolabial folds and the lips were the areas most likely to be affected by vascular occlusion. (Alam et al., JAMA Dermatol 2021)
- Needle or cannula: the same survey recorded about one occlusion per 6,410 syringes with needles and one per 40,882 with cannulas. (Alam et al., JAMA Dermatol 2021)
Figures checked on 27 October 2026 against the published abstracts. They describe study populations, not an individual result; suitability is decided at an in-person assessment.
What are the side effects of lip fillers, and when should you call?
Most lip filler side effects are tenderness, swelling and bruising that settle within one to two weeks. Lumps, cold sores and filler drifting above the lip border are less common, and blocked blood flow is rare.
Lips swell more than most areas because they are soft, mobile and rich in blood vessels, and the swelling is often uneven for the first few days: one side, or the upper lip, can look larger until it settles. That is why the shape is judged at the review two to four weeks later, not on the first morning.
| When | What can happen | What it usually means | What to do |
|---|---|---|---|
| During or within hours | Pale, dusky or mottled skin on the lip or the skin above it; severe or increasing pain; very rarely, a change in vision | Possible vascular occlusion: rare and time-critical | Contact the clinic immediately; for any change in vision, go to the nearest emergency department |
| Days 1–3 | Swelling, often worse on waking; tenderness; bruising | Expected | Cold compress, sleep slightly propped up, avoid heat, alcohol and strenuous exercise |
| Days 2–5 | Tingling, then small blisters at the lip border | A cold sore flare triggered by the injections | Contact the clinic; antiviral treatment may be prescribed |
| Weeks 1–2 | Small firm beads, slight asymmetry | Usually swelling or gel still settling | Do not massage unless advised; review at two to four weeks |
| Weeks to months | A lump that persists, fullness above the border (a “filler moustache”), swelling that comes and goes | Placement, overfilling, migration or a delayed reaction | Review in person, often with ultrasound; hyaluronic acid can usually be dissolved |
Contact the clinic that treated you immediately if, during or after filler, the skin turns pale (blanching), mottled or dusky, or pain is severe or increasing: these can be signs of vascular occlusion, where filler blocks blood flow. Any change in vision is an emergency: go to the nearest emergency department straight away. Do not try to treat it yourself or wait for the next appointment.
Each of these has its own guide. Lip filler side effects covers the swelling timeline, lumps, cold sores and rarer reactions in detail; filler migration explains why product drifts above the lip border; lumps after filler separates normal swelling from a nodule; and vascular occlusion after filler sets out the warning signs and why speed matters. The wider picture, across every area, is in dermal filler complications.
Risk is lowered by planning depth around the labial arteries, injecting slowly in small amounts, using a cannula where it suits the lip, asking about cold sores beforehand and reviewing before anything more is added. Dr Sin Yong performs injectable treatments himself; hyaluronidase and an anaphylaxis kit are kept on site, and the clinic keeps an emergency protocol for vascular events (safety and emergency readiness). If lip filler placed elsewhere needs removing, see filler dissolving in Singapore.
Frequently asked questions
How much do lip fillers cost in Singapore?
It depends on the amount of product, the product, staging and what review is included. IN Eternity Clinic gives a written quote after assessment; the consultation fee is S$120, waived with any medical treatment. Other clinics’ published lip filler prices, read on 20 October 2026, are shown on this page.
How long do lip fillers last?
Often around six to twelve months, because the lips move constantly and break hyaluronic acid down faster than quieter areas. It varies between people and products, and some product can remain longer than it looks.
Will my lips look natural?
That is the aim. The plan starts from your proportions, keeps the border crisp, keeps the lower lip a little fuller than the upper and uses modest amounts, with any refinement at review once swelling has settled.
Does lip filler hurt?
The lips are sensitive, so numbing cream is applied first and most lip fillers contain a local anaesthetic. Most people describe pressure and brief stinging; ice afterwards helps with tenderness.
How long does lip filler swelling last?
Swelling usually peaks in the first two to three days and settles over about a week, sometimes up to two. Lips can look fuller than the final result at first, so plan treatment at least two weeks before an event.
Can lip filler be dissolved?
Yes. Lip fillers are hyaluronic acid, which can usually be broken down with hyaluronidase, a prescription enzyme kept at the clinic. Collagen-stimulating fillers are not used in the lips.
Lip filler or lip flip: which do I need?
Filler adds shape, definition, hydration or volume. A lip flip uses a few anti-wrinkle injections to relax the muscle so the upper lip rolls out slightly when you smile. They solve different problems and are sometimes combined.
Who should not have lip filler?
Treatment is postponed during pregnancy and breastfeeding, with an active cold sore or infection, or around dental work. People with recurrent lip swelling, autoimmune conditions or previous filler reactions are assessed carefully first.
When will I see the final result of lip filler?
The new shape shows straight away, but lips swell more than most areas, so they usually look fuller than the final result for several days. The settled result appears after about two weeks and is judged at the review two to four weeks after treatment, when any small refinement is planned rather than on the day.
Can I kiss or drink through a straw after lip filler?
Gentle drinking is fine the same day, but firm pursing, sucking through a straw and kissing are avoided for the first day or two, while the lips are tender and the gel is settling. Avoid very hot drinks while numbness lasts. If a cold sore appears afterwards, avoid kissing and contact the clinic.
Can lip filler fix uneven lips?
It can often balance differences between the two sides or between the upper and lower lip, using small amounts placed where they are needed. Some unevenness comes from the teeth, muscles or bone rather than the lips themselves, and filler only partly helps there. Wider causes are covered in asymmetrical face.
What is the difference between Russian lips and natural lip filler?
Russian lips is a technique that lifts the upper lip vertically for a flatter, doll-like profile. It can suit some lips, but it uses more product near the border and can blur the outline if overdone. The plan here starts from your proportions, and the look is agreed first.
Can lip filler help dark lips?
No. Filler changes shape and hydration, not colour. Dark or patchy lips usually come from pigment in the lip, which is assessed and can be lightened with lip pigmentation treatment; soft colour can then be added with lip blush. Filler and colour treatments are spaced apart so swelling does not affect either.
Is lip filler safe for darker skin?
Yes. Filler uses no heat, so it carries little pigment risk in skin types III to V. A bruise on darker lips can occasionally leave a brownish tint that fades over weeks. Bruising is reduced with a cannula where suitable, slow injection and avoiding alcohol beforehand; more on darker skin tones.
How should I prepare for lip filler?
Mention any cold sores, so preventive treatment can be prescribed, and tell the clinic about blood-thinning medicines or supplements without stopping prescribed ones. Avoid alcohol the day before, keep dental appointments a couple of weeks away from treatment, and allow at least two weeks before an important event.
What is a filler moustache, and how is it avoided?
It is filler that has drifted above the lip border, making the upper lip look puffy or shadowed, usually after repeated or large treatments. It is avoided by modest amounts, placement within the lip and review before more is added. Hyaluronic acid that has migrated can usually be dissolved with hyaluronidase after an ultrasound check.
Can I go back to work after lip filler?
Usually, yes. Many people return to work the same day or the next; the lips may look fuller and slightly uneven for a day or two, and small marks can be covered with make-up from the next day. If you have an event, plan treatment at least two weeks before it so the swelling has settled.
Is it normal for lip filler to feel lumpy?
In the first week, often yes. Swelling and gel that has not yet settled can feel like small beads, especially along the border, and most soften over two to four weeks without massage, which is avoided unless advised. A lump that is still there at review, is visible, or is tender and red is assessed in person, and hyaluronic acid can be dissolved if needed.
When should I worry after lip filler?
Contact the clinic immediately if part of the lip or the skin above it turns pale, white, dusky or mottled, or if pain is severe or increasing; for any change in vision, go to the nearest emergency department. Blisters, spreading redness, heat or fever in the following days also need prompt review. Ordinary swelling, even when uneven, usually settles within a week.
Can lip filler trigger a cold sore?
Yes. The injections can reactivate the cold sore virus in people who carry it, usually within a few days. If you have had cold sores, tell the doctor beforehand, as preventive antiviral treatment may be prescribed. Treatment is postponed while a sore is active, and a sore that appears after treatment should be reported to the clinic.
How often should lip filler be repeated?
There is no fixed schedule. Many people review their lips every six to twelve months, but some product often remains longer than it looks, so each visit starts with a fresh assessment rather than a routine repeat. Adding filler on a timetable while earlier product is still present is a common reason lips gradually lose their border.
Why does one side of my lip look bigger after filler?
Uneven swelling is common for the first few days, because each side swells differently and sleeping on one side can add to it. Most of it settles within a week. If one side still looks larger at the review two to four weeks after treatment, a small adjustment can be planned then rather than earlier.
Book an assessment
IN Eternity Clinic, 9 Scotts Road, #12-01 Pacific Plaza, Singapore 228210. By appointment with Medical Director Dr Sin Yong. Monday to Saturday, 11am to 8pm. WhatsApp or call +65 8815 3008. The consultation fee is waived with any medical treatment.
International KOL — CLASSYS · HIRONIC · DEKA · ALMA · FOTONA · LUTRONIC
References
- Lee SH, Gil YC, Choi YJ, Tansatit T, Kim HJ, Hu KS. Topographic anatomy of the superior labial artery for dermal filler injection. Plast Reconstr Surg 2015;135(2):445-450. doi:10.1097/PRS.0000000000000858
- Popenko NA, Tripathi PB, Devcic Z, Karimi K, Osann K, Wong BJF. A quantitative approach to determining the ideal female lip aesthetic and its effect on facial attractiveness. JAMA Facial Plast Surg 2017;19(4):261-267. doi:10.1001/jamafacial.2016.2049
- Liew S, Wu WTL, Chan HH, et al. Consensus on changing trends, attitudes, and concepts of Asian beauty. Aesthetic Plast Surg 2016;40(2):193-201 (online 2015). doi:10.1007/s00266-015-0562-0
- Sundaram H, Cassuto D. Biophysical characteristics of hyaluronic acid soft-tissue fillers and their relevance to aesthetic applications. Plast Reconstr Surg 2013;132(4 Suppl 2):5S-21S. doi:10.1097/PRS.0b013e31829d1d40
- Signorini M, Liew S, Sundaram H, et al. Global Aesthetics Consensus: avoidance and management of complications from hyaluronic acid fillers — evidence- and opinion-based review and consensus recommendations. Plast Reconstr Surg 2016;137(6):961e-971e. doi:10.1097/PRS.0000000000002184
- Beleznay K, Carruthers JDA, Humphrey S, Carruthers A, Jones D. Update on avoiding and treating blindness from fillers: a recent review of the world literature. Aesthet Surg J 2019;39(6):662-674. doi:10.1093/asj/sjz053
- DeLorenzi C. New high dose pulsed hyaluronidase protocol for hyaluronic acid filler vascular adverse events. Aesthet Surg J 2017;37(7):814-825. doi:10.1093/asj/sjw251
- Singapore Medical Council. Guidelines on Aesthetic Practices for Doctors (2016 edition). healthprofessionals.gov.sg/smc
- Funt D, Pavicic T. Dermal fillers in aesthetics: an overview of adverse events and treatment approaches. Clin Cosmet Investig Dermatol 2013;6:295-316. doi:10.2147/CCID.S50546
- Cavallini M, Gazzola R, Metalla M, Vaienti L. The role of hyaluronidase in the treatment of complications from hyaluronic acid dermal fillers. Aesthet Surg J 2013;33(8):1167-1174. doi:10.1177/1090820X13511970
- Czumbel LM, Farkasdi S, Gede N, et al. Hyaluronic acid is an effective dermal filler for lip augmentation: a meta-analysis. Front Surg 2021;8:681028. doi:10.3389/fsurg.2021.681028
- Alam M, Kakar R, Dover JS, et al. Rates of vascular occlusion associated with using needles vs cannulas for filler injection. JAMA Dermatol 2021;157(2):174-180 (online 2020). doi:10.1001/jamadermatol.2020.5102
These sources describe mechanisms and general evidence. They are not a promise of any individual result; suitability is decided at an in-person assessment.