- What is a double chin (submental fullness)? What causes it?
- Does reducing a double chin on your own actually work?
- Submental fat-dissolving injections — deoxycholic acid
- HIFU — tightening skin and dissolving submental fat
- Thread lifting in the chin-neck area
- Submental liposuction — the Gold Standard
- Chin filler + Platysma Botox
- Comparison: which method suits which type of double chin?
- Double chin reduction pricing and the factors that set the price
- Safety and what to watch out for
- Double chin reduction in Phitsanulok — de Pry Clinic
- Frequently asked questions
- References and verification
Every time you look in the mirror or take a photo, the fat under your chin seems to be the first thing that pops up, making your face look heavy and chipping away at your confidence — I understand this feeling well. Many people who come to consult with me say they've tried exercise, massage, and all sorts of neck-stretching moves, but the double chin still won't budge.
Before deciding to do anything, I want you to know first that a double chin is not the same problem for everyone. For some people it comes from fat, for some from sagging skin, and for some from the chin structure itself. Each cause needs a different solution. Choosing the wrong one wastes both money and time with no results.
In this article, Dr. Time has gathered every evidence-backed way to reduce a double chin — from do-it-yourself methods to every medical option — along with an explanation of which one suits which type of double chin and how strong the evidence is, so you can decide with confidence.
- Double chin from fat → fat-dissolving injections (deoxycholic acid) or liposuction
- Double chin from sagging skin/muscle → HIFU or thread lifting
- Double chin from a short chin structure → chin filler (helps make the facial frame look sharper)
Diagnosing which type your double chin falls into is the single most important thing before choosing a method.
What is a double chin (submental fullness)? What causes it?
A double chin (Double Chin / Submental Fullness) is when the area under the chin looks bulging or saggy, making the dividing line between the face and the neck unclear. It can arise from several different mechanisms, not just being "overweight" as many people understand it.
Double chin from fat (Submental Fat)
The most common cause — subcutaneous fat accumulating under the chin, soft and pinchable when pressed. Even people of normal weight can have it if genetics make them store fat here in particular. Overall weight loss helps somewhat but often doesn't clear it completely, because the body chooses to break down fat throughout the whole body, not in one specific spot.
Double chin from sagging skin and muscle
As you age, collagen and elastin in the skin layer decrease, and the platysma muscle (the band of muscle running along the neck) weakens, causing the skin under the chin to droop. When pressed, this type won't feel soft and bouncy like fat, but instead hangs down as a sheet. It's better suited to tightening with HIFU or thread lifting than to dissolving fat.
Double chin from jaw and chin structure
People with a short chin (Weak Chin / Recessed Chin) or a low jawline will find that even a little fat under the chin looks like a very obvious double chin, because there's no structure to support it. The on-target fix is to add filler to increase the projection of the chin, which helps the facial frame look sharper and the double chin look smaller immediately — without dissolving any fat at all.
Mixed double chin — common in the clinic
Many people have a double chin from several causes at once, such as both accumulated fat and skin that's starting to sag. Treatment may therefore need to combine more than one method after I have assessed it.
Soft and pinchable as a lump = likely fat → suited to fat-dissolving injections or liposuction
Thin and hanging down when pressed = likely sagging skin → suited to HIFU or thread lifting
Short chin / small jaw structure = structural → suited to chin filler
This test is a preliminary guide. A correct diagnosis requires a direct examination by a doctor.
Does reducing a double chin on your own actually work?
Got questions? Dr. Time offers personalized, honest consultations — no upselling.
Consult Dr. TimeThe truth about spot reduction
Exercising or doing targeted workouts to dissolve fat directly under the chin is almost impossible according to science. The phenomenon known as "spot reduction" (dissolving fat in one specific spot) has been proven untrue for general exercise.
Research from Harvard Health Publishing found that facial and neck exercises don't make the fat in that area dissolve directly; instead, the body breaks down fat from all over the body in the order genetics dictate. So a person with genetic submental fat may have to lose a lot of weight before the double chin visibly shrinks.
Do-it-yourself methods that genuinely work
What genuinely helps when done on your own is reducing fat throughout the whole body via the following:
- Calorie Deficit — manage your diet to burn more energy than you take in by 300–500 kcal/day, consistently
- Cardio + Resistance Training — combine exercise types, not just walking, to preserve muscle mass while losing fat
- Neck exercises — help tighten the platysma muscle a little, but this is not fat dissolving
If you've lost weight well but the double chin still hasn't subsided — it usually means the double chin comes from genetics or structure, which do-it-yourself methods can't reach. Consulting a doctor for an assessment will give you the most precise answer on what to do next.
Submental fat-dissolving injections — deoxycholic acid
Submental fat-dissolving injection is the method with the strongest research evidence among non-surgical options. The main substance used is deoxycholic acid (Deoxycholic Acid), a bile acid the body produces naturally to digest and break down fat in the digestive system. When injected into the subcutaneous fat layer under the chin, it permanently destroys the membranes of the fat cells.
Clinical evidence
Here is data from real research that you can verify:
- A Phase 3 study (PMID 30272141) measured fat volume with a 3D scanner and found that fat volume decreased with statistical significance (P = 0.004), requiring on average about 3.4 sessions
- The most common side effects are temporary swelling (+8.68% in the first week) and numbness in the injection area, which resolve on their own within 2–4 weeks. There were no severe complications in this study
- The U.S. FDA has approved the product Kybella (registration number 206333) specifically for submental fat
| Details | Deoxycholic acid (standard) | Meso fat (Mesotherapy Fat) |
|---|---|---|
| Mechanism | Destroys fat cell membranes → permanent | Mixes several lipolytic agents → stimulates breakdown |
| Research evidence | ✅ Phase 3 RCT + FDA approved | ⚠️ Limited evidence, depends on the formula |
| Average number of sessions | 3–4 sessions (4–6 weeks apart) | 4–6 sessions |
| Main side effects | Swelling, numbness 2–4 weeks | Swelling, bruising |
| Result when complete | Fat cells gone permanently | Reduces volume, not as permanent |
| Thai FDA | Product must be registered | Depends on the substance — some require registration |
How it's injected and what you need to know
The doctor divides the under-chin area into a grid and injects 0.2 ml per point, 1 cm apart. This spacing is very important, because it must avoid the Marginal Mandibular Nerve that runs along the lower jawline. If injected incorrectly, it can cause a temporary drooping at the corner of the mouth — which is why it must be done by a doctor who directly understands the anatomy of this area.
- ✅ Clear submental fat, soft and pinchable when pressed
- ✅ Skin not yet very saggy (mostly ages 25–50)
- ✅ Want a permanent result without surgery
- ❌ Not suitable: very saggy skin but little fat (HIFU/thread lifting should be used instead)
- ❌ Not suitable: pregnant, breastfeeding, or having blood clotting problems
HIFU — tightening skin and dissolving submental fat
HIFU (High-Intensity Focused Ultrasound) used for the under-chin area works through 2 mechanisms at the same time: (1) it delivers heat energy to the SMAS layer (the muscular fascia layer) and the subcutaneous fat to stimulate new collagen production and tighten the skin, and (2) with the 4.5 mm and 6.0 mm energy cartridges that reach the fat layer, it also helps reduce fat volume.
HIFU research evidence for the submental area (2025)
The latest 2025 research (PMID 40355620) studied 30 Asian patients who underwent HIFU to reduce submental fat and found the following:
- 82% of patients reported improvement from self-assessment
- The CR-SMFRS (Clinician-Reported Submental Fat Rating Scale) metric improved with statistical significance (P < 0.000005)
- Used the 4.5 mm cartridge (fat layer) + 6.0 mm cartridge (deep layer) together
- No severe side effects were found; minor side effects resolved on their own within 2 weeks
HIFU machines used for this area
The HIFU machines with supporting data for the under-chin area at present include:
- Ultraformer III — has 4.5 mm and 6.0 mm energy cartridges for the fat layer, usable for Thai/Asian people whose skin is thicker and whose fat layer differs from Westerners
- Ultherapy (Ulthera) — the first machine to receive FDA clearance for face lifting, with a 4.5 mm cartridge as well
- ✅ Skin starting to sag in the chin-neck area, but not too much yet
- ✅ Mild to moderate submental fat, wanting tightening together with fat reduction
- ✅ Want gradual, natural-looking results with no downtime
- ✅ Can go home right after, with less swelling than injections
- ❌ Not suitable: very, very saggy skin (must combine threads/liposuction)
- ❌ Not suitable: having filler or an implant in that area
When do HIFU results show?
HIFU stimulates new collagen production, which takes time — results gradually become clearer over 2–4 months after treatment, and reach their full extent at around 6 months. This differs from fat-dissolving injections, which show results in 4–8 weeks per session. The advantage is that the result looks more natural because the body adjusts gradually on its own.
Thread lifting in the chin-neck area
PDO (Polydioxanone) or PLLA (Poly-L-Lactic Acid) threads in the under-chin area and along the jawline work by creating a pulling force that tightens sagging skin, while stimulating collagen production around the thread. It's suitable for people with sagging skin under the chin who have little fat but whose skin is starting to droop.
Threads used for this area
There are several types of threads used in the chin-neck area:
- Smooth Threads — stimulate collagen, don't lift; suited to improving skin texture and elasticity
- Cog Threads (barbed threads) such as MINT, Silhouette Soft — have barbs that pull the skin, lifting more noticeably; suited to lifting the lower jawline
- Barbed Threads / Bidirectional — strong lift, clear results, but more downtime
The HIFU research (PMID 40355620) notes that thread lifting has limited clinical evidence and results often don't last long. For submental fat specifically, thread lifting alone usually gives little result, since it doesn't dissolve fat — but it's suitable for lifting the facial frame or combining with HIFU for a result that covers both fat and sagging skin.
Who is thread lifting suitable for?
Thread lifting in this area gives the best results in cases of:
- Sagging skin in the lower cheek-lower jaw-under chin area, wanting a quicker, clearer lift
- Little fat, with the main problem being drooping skin, not accumulated fat
- As an add-on after HIFU to enhance the lifting result
- Wanting faster results than HIFU (more immediately visible, but not lasting as long)
General thread-lifting results last 1–2 years depending on the thread type and aftercare, after which the threads gradually dissolve on their own.
Submental liposuction — the Gold Standard
Submental liposuction is the Gold Standard for removing large amounts of submental fat, giving the most certain and permanent result of all methods, since it removes the fat directly. The Phase 3 research that compared it against deoxycholic acid also found liposuction to be the reference standard, because its results are the clearest and fastest.
Types of submental liposuction
- Traditional Liposuction — uses a cannula to suction out fat; a standard method with clear results
- Laser-Assisted Liposuction (SmartLipo) — uses a laser to liquefy the fat first, making suctioning easier, with added skin-tightening from the heat
- VASER (Ultrasound-Assisted) — uses sound waves to separate the fat before suctioning, gentler on the surrounding tissue
- Requires local anesthesia or general anesthesia, depending on the size of the treated area
- Swelling and bruising for 1–2 weeks; full results seen 1–3 months after the swelling subsides
- There are small scars from inserting the cannula, which fade considerably after 3–6 months
- Results are permanent, but if your weight increases a lot afterward, the remaining fat may expand
- Suitable for people who want fast, clear results and can accept downtime
Chin filler + Platysma Botox
Chin filler — for a short chin structure
Chin filler (Chin Filler / HA Filler for Chin Augmentation) doesn't dissolve the double chin, but makes the facial frame look sharper and the double chin look smaller optically. When the chin projects in proportion to the jaw and nose, the line of the facial frame looks crisper, and the skin under the chin looks more taut even though the fat is the same.
Fillers popular for the chin area include Juvederm Volux, Restylane Lyft — which have high viscosity and bear weight well, with results lasting 12–18 months
Platysma Botox — adjusting the neck bands that pull down
The platysma muscle is a flat band of muscle running along the neck. As you age, the platysma contracts and pulls the skin downward, making the chin-neck angle look unclear. Injecting Botox into the platysma (called a Nefertiti Lift or Platysma Band Treatment) reduces this pulling force, making the chin frame look sharper.
Platysma Botox is suitable for people with visible platysma bands when smiling/tensing the face. Results last 3–4 months; repeat injections are needed to maintain the result.
Comparison: which method suits which type of double chin?
| Method | Suitable for | Not suitable | How long results last | Downtime | Evidence |
|---|---|---|---|---|---|
| Fat-dissolving injection (Deoxycholic Acid) | Submental fat, non-surgical, want permanence | Very saggy skin, very little fat | Permanent (destroyed cells) | Swelling–numbness 2–4 weeks | ✅✅✅ Phase 3 RCT + FDA |
| HIFU | Fat + mild-to-moderate sagging skin | Very, very saggy skin | 1–2 years (newly built collagen) | Almost none, can go home after | ✅✅ RCT + Asian study 2025 |
| PDO thread lifting | Sagging skin, clear and fast facial-frame lift | Lots of fat, short chin structure | 1–2 years | Bruising–swelling 3–7 days | ⚠️ Limited evidence |
| Liposuction | Lots of fat, want fast certain results | Want 0 downtime | Permanent | 1–2 weeks swelling and bruising | ✅✅✅ Gold Standard |
| Chin filler | Short chin structure, structural double chin | Lots of fat, very saggy skin | 12–18 months | Minor bruising 3–5 days | ✅✅ HA filler safety data |
| Platysma Botox | Neck bands pulling, chin not sharp | Lots of fat, very saggy skin | 3–4 months | Almost none | ✅✅ Botulinum toxin data |
Soft + pinchable = fat → fat-dissolving injection (if mild-to-moderate amount) or liposuction (if a lot/want fast results)
Thin hanging skin + hard to tighten = sagging skin → HIFU (if not very saggy) or thread lifting (if you want a fast lift) or a combination
Short chin + small jaw structure = structural → chin filler ± jaw filler
A mix of several things → may need to combine several methods; let the doctor assess first
Double chin reduction pricing and the factors that set the price
What does the price depend on?
Many people ask the price directly, but the truth is that double chin reduction has a very wide price range, because it depends on:
- The chosen method — each method has different costs (equipment, products, time)
- The amount and size of the area — fat-dissolving injections are priced by the amount of substance (ml) and the number of sessions; HIFU is priced by the number of shots; thread lifting is priced by the number of threads
- The severity of the problem — a mild double chin uses less than a large double chin that needs multiple sessions
- The clinic's location — clinics in Bangkok often have different prices from those in the provinces for the same service
Why doesn't the doctor just quote a price right away?
Because quoting a price without seeing the actual problem can cause a lot of misunderstanding. For example, a person with little submental fat may only need 1–2 dissolving sessions, but a person with a lot may need 3–4, with prices differing by 2–4 times. If the doctor quoted a single flat rate, it might be overpriced for an easy case, or too cheap for a complex case.
Come in for a consultation first — Dr. Time will assess the cause, propose a suitable method, and state the price clearly before you decide, with no pushy selling or hidden charges. If the doctor sees that just managing your weight is enough, the doctor will tell you honestly.
Safety and what to watch out for
Anatomical risk points of the under-chin area
The under-chin area has important structures to be careful of:
- Marginal Mandibular Nerve — the nerve that controls the lower corner of the mouth, running near the lower jawline; if affected, it causes temporary drooping at the corner of the mouth
- Submandibular Gland (salivary gland) — located under the jaw on both sides; must be avoided when injecting substances
- Minor blood vessels and nerves — in the various layers of the neck
There are reported cases from beauty salons and substandard clinics that injected mixed formulas of unknown drugs in this area, causing severe infection, tissue necrosis, and permanent scarring. Checking the product registration with the FDA is important, and it should be done only with a doctor who holds a license to practice medicine.
Contraindications and precautions
- Pregnant or breastfeeding — none of the mentioned methods should be done
- Having a disease affecting blood clotting, or taking anticoagulant medication — consult a doctor first
- Having an infection in the area to be treated — it must be cured first
- Recently had surgery under the chin, or have an implant in that area — always inform the doctor beforehand
Warning signs after treatment that require returning to the doctor promptly
- Swelling or redness increasing instead of gradually subsiding (may be a sign of infection)
- Fever, chills
- Pain getting progressively worse instead of improving
- Numbness or weakness at the corner of the mouth or tongue
Double chin reduction in Phitsanulok — de Pry Clinic
At de Pry Clinic Phitsanulok, Dr. Time starts by examining and palpating the under-chin area directly, to distinguish whether your double chin comes from fat, sagging skin, or chin structure — because the doctor believes that a correct diagnosis before choosing a method is the heart of a good result.
The doctor performs every procedure personally, never handing it off to other staff, and uses products that are fully FDA-registered. The doctor is glad to tell you the truth, even when the answer is "you don't need to do it yet, manage your weight first" or "a cheaper method works about the same" — the doctor will say so.
- Submental fat-dissolving injections (deoxycholic acid, FDA-registered)
- HIFU lifting and tightening for the under-chin and neck
- PDO thread lifting in the jaw-chin area
- Chin filler to adjust the structure
- Platysma Botox (Nefertiti Lift)
If you're in Phitsanulok or a nearby province and want to know which method suits your double chin — you can consult Dr. Time at no charge. Get an assessment first, then decide.
Frequently asked questions
Can a double chin be reduced without surgery?
Yes. There are fat-dissolving injections (deoxycholic acid), HIFU, and thread lifting, all of which are non-surgical, but each method suits a different cause. Choosing the one that matches the root cause gives the best result.
Do I need to take time off work afterward?
It depends on the method — HIFU has almost no downtime, you can go home and work right away. Fat-dissolving injections may have visible swelling for 3–7 days, thread lifting has bruising and swelling for 3–7 days, and liposuction 1–2 weeks. The doctor will advise based on your situation and your work.
Do fat-dissolving injections hurt?
There's moderate pain during the injection, like a twitching needle. The doctor usually applies a numbing cream beforehand to reduce the sensation. Most of the discomfort is during the injection; afterward you feel more of a swollen tightness than pain.
Can several methods be combined?
Yes, in many cases. For example, fat-dissolving injection + HIFU gives a result covering both fat and sagging skin, or HIFU + thread lifting to lift the facial frame while tightening. But it must be assessed against each person's skin condition and the spacing between treatments.
How does a double chin from weight gain differ from one from genetics?
A double chin from weight gain usually reduces somewhat with weight loss, while one from genetics tends to persist even at normal weight. If you've lost weight and the double chin still hasn't subsided, it's usually a sign that it comes from genetics and requires medical methods.
References
I have gathered the information in this article from research and reliable sources as follows — click to view the originals:
- Phase 3 RCT, deoxycholic acid (PMID 30272141) — 3D outcome measurement, efficacy of Kybella for submental fat (2018): pubmed.ncbi.nlm.nih.gov/30272141/
- HIFU reduction of submental fat in Asian patients (PMID 40355620) — efficacy and safety of submental HIFU in Asian skin (2025): pubmed.ncbi.nlm.nih.gov/40355620/
- DermNet NZ — Deoxycholic Acid — mechanism and side effects of deoxycholic acid: dermnetnz.org
- FDA Drugs@FDA — Kybella (ApplNo 206333) — official Kybella approval information from the FDA: accessdata.fda.gov
- MedlinePlus — deoxycholic acid — drug use, precautions, side effects: medlineplus.gov
- Harvard Health — face-neck exercises, can spot reduction really work: health.harvard.edu
- Thai FDA — product search system — verify the registration of drugs and products clinics use in Thailand: porta.fda.moph.go.th
