Jawline Gum: Does Chewing Gum Actually Help Your Jawline?
Jawline gum can train your chewing muscles, but it won't give you a sharper jawline. In a 2024 trial, people who chewed gum three times a day for six months had a stronger bite by month three, but their masseter size and jaw shape didn't change.
Jawline gum is the extra-hard stuff: mastic or a very tough gum base, sold as "facial fitness" gum. TikTok and looksmaxxing communities pitch it as a no-surgery way to a chiseled jaw.
A defined jawline mostly comes down to bone structure, body fat and age. To see where yours stands, check how jawline rating works, and for how it fits into your overall look, see our attractiveness test guide.
Does Chewing Gum Help Your Jawline?
Chewing gum can raise your bite force, but nothing shows it makes your jawline sharper. The masseter, the muscle gum works hardest, sits at the angle of your lower jaw, so if it grows, your lower face gets wider, not more defined. Jaw definition comes from bone and low fat over it.
Here's what gum can and can't change:
Goal | Does gum do it? |
|---|---|
Stronger bite | Yes. Bite force rose after 3 months in the 2024 trial |
Bigger masseter | Not shown. No significant change after 6 months in that trial |
Sharper jaw angle (bone) | No. The trial found no change in jaw shape, and surgeons quoted by Popular Science say gum doesn't affect the bony part of the jawline |
Less face fat | No. Exercising a muscle doesn't burn the fat over it, and a meta-analysis of localized training found no spot reduction |
What Jawline Gum Actually Does to Your Face
Chewing gum works your chewing muscles, mainly the masseter and temporalis. It doesn't touch the jaw bone or the fat over it, which are what make a jawline look sharp. At best, a bigger masseter makes your lower face wider and squarer, not more defined.
Where the masseter sits
The masseter runs from your cheekbone down to the corner of your lower jaw, the jaw angle. When it gets thicker, it adds mass on the outside of that corner, so the lower face reads as wider. The temporalis sits higher, on the side of your head, so it adds nothing to the jawline.
Experts quoted in an ADA News roundup say tougher gum may make the face squarer or wider without improving the undersurface of the jawline.
Why a bigger muscle doesn't mean a sharper jawline
Three layers decide how a jawline looks, and gum only reaches one of them:
Bone: sets your jaw angle and chin. Gum doesn't change it.
Fat: the layer over the bone and under the chin. On most people this is what hides definition, and a facial plastic surgeon quoted by Popular Science says losing a little weight can change it a lot.
Muscle: the only layer gum touches, and the only change it can make is width.
That's why "wider" and "sharper" get mixed up online. Even the width effect isn't guaranteed: the same surgeon says you would likely need excessive hours of chewing for weeks, and any change would fade once you stopped.
What the Research Says About Chewing Gum and Your Jaw
Research on gum and jaw shape is thin. One 2024 randomized trial found that gum chewing three times a day raised bite force but, over six months, didn't change masseter thickness or jaw shape. Experts quoted by ADA News and Popular Science doubt that hard gum sharpens the jaw.
The 2024 randomized trial
The study by Jung et al. in the Journal of Oral Rehabilitation is the closest thing to a direct test:
58 healthy adults were split into a gum group and a control group that did no chewing training.
The gum group chewed gum three times a day for six months.
Bite force was significantly higher at the 3-month check than at baseline and than in the control group.
Masseter thickness and jaw shape showed no significant difference from baseline.
Science News describes it as a test of typical gum, so it can't tell us what extra-hard gum does. Treat it as a strong signal, not the final word.
What experts say
ADA News roundup: tougher gum may strengthen the masseter and give a squarer or wider face, not a sharper jawline. It also warns that chewing too much can cause inflammation and jaw pain. This is a digest of a media report, not an official ADA position.
Surgeons quoted by Popular Science: gum does nothing for the bony part of the jaw, and the average person only presses their teeth together to chew for about an hour to an hour and a half a day. Chewing for four or five hours goes far past that.
Science News: a June 2026 piece on mastic gum found no research behind the jaw-sharpening claims and cited the same Korean trial. The USC orofacial medicine specialist quoted there doesn't recommend chewing any sort of gum.
Mastic Gum and Jawline Gum Brands: Do They Work Better?
Mastic gum and brand-name jawline gums are harder to chew than regular gum, so they load your chewing muscles more. That doesn't mean they change your face: an orofacial medicine specialist quoted by Science News says there is no research behind the jaw-sharpening claims.
What mastic gum is
The material: mastic is a resin from a tree grown on the Greek island of Chios, chewed for centuries for stomach problems. Modern mastic gum adds things like spearmint and calcium.
What it's actually studied for: a 2023 review found oral health benefits, such as less plaque and fewer cavities. Jaw shape isn't on that list.
How it's sold: Science News found that three of the five major mastic gum brands marketing on TikTok push the jaw-sharpening angle.
Jawline gum brands
Brands like Jawliner, Rockjaw and Stronger Gum sell very hard gum as a facial workout. The pitch is simple: harder gum, more resistance, bigger muscle. But hardness was never the missing piece. Muscle growth only adds width (see above), and gum doesn't change bone or fat.
The same logic applies to silicone jaw exercisers: more resistance on the same muscle. Harder gum also puts more strain on your jaw joints, which is covered in the safety section below.
How Long Does It Take to See Results From Jawline Gum?
There is no proven timeline, because research hasn't shown a visible jawline change from gum at all. In the 2024 trial, six months of chewing three times a day didn't change masseter thickness or jaw shape. Claims of results in a few weeks come from marketing and social media posts, not studies.
Why before-and-after photos prove little
Angle and tension: a clenched jaw, a lifted chin or different lighting can change how a jawline looks between two photos. Here's how to take before-and-after photos that hold up.
Other changes: weight, water retention and sleep all show up in the lower face.
Age: a dermatologist quoted by CBS Pittsburgh says teens will likely see more definition naturally as they reach their 20s and 30s.
How long should you chew gum for your jawline?
No duration has been tested, so every number you see online is a guess. TikTok routines range from short daily sessions to hours, and a surgeon quoted by Popular Science says any visible change would likely take excessive chewing for weeks. That is exactly the kind of use that causes problems, covered next.
Is Jawline Gum Safe? Risks of Chewing Hard Gum Every Day
Chewing extra-hard gum for hours can overload your jaw muscles and joints. Reported problems include jaw pain, headaches and clenching, and the risk is higher if you already have jaw issues. No safe dose of hard gum has been tested, so any daily routine you see online is a guess.
What can go wrong
Jaw pain and joint problems: the NIDCR, part of the NIH, lists gum chewing among habits to cut back on if you have a jaw joint disorder (TMD). Surgeons quoted by Popular Science add that overworked jaw muscles can spasm and cause lockjaw episodes.
Headaches: in a small Pediatric Neurology study, 30 kids and teens with chronic headaches who chewed gum every day quit for a month, and 26 improved while 19 had no more headaches. There was no control group, so it shows a link, not proof.
Clenching: an orofacial medicine specialist quoted by Science News has seen gum-chewing patients develop jaw pain or clench so hard they ground through a night guard.
Ingredients: the ADA News roundup notes that some facial-fitness gums contain caffeine and vitamin B5, which can act as a laxative in higher doses. Check the label.
Not every study points the same way. A 2025 study of young adults in the Journal of Clinical Medicine found no link between gum chewing and jaw joint disorders, though the authors say it may matter when other factors are present.
If you're a teen
Teens are the main audience for jawline gum, and they were the group in the headache study. If you get jaw pain, clicking or headaches, stop chewing and talk to a dentist or doctor.
Why Your Jawline Might Not Look Defined (and What Actually Changes It)
A jawline looks soft when fat or loose skin covers its edge, or when the bone underneath sits back. Weak chewing muscles are rarely the reason. Body fat is the factor you can change the most; bone structure is mostly set by genetics.
What decides how defined your jawline looks
Body fat: especially under the chin and along the neck. The facial plastic surgeon quoted by Popular Science says losing a little weight can change jaw definition a lot.
Skin and age: loose skin, mostly in older adults, softens the edge of the jaw.
Bone structure: jaw angle, chin projection and jaw width come from genetics and growth. Gum doesn't change them, as the 2024 trial showed.
Muscle: masseter size adds width, not sharpness.
For the realistic options, see our guide on how to sharpen your jawline.
AI face analysis tools score jawline definition from a photo as one trait among many. Our guide to how AI face analysis works covers what they measure and where the estimates fall short.
Can chewing gum reduce a double chin or face fat?
No. Chewing works your jaw muscles, and a systematic review and meta-analysis of localized exercise training found no spot reduction of fat. A small Cureus case report on a jaw exerciser also saw no change in the double chin or jawline, and notes that weight, genetics and aging are common causes of a double chin.
Not sure whether the jaw is even your weak spot? A facial feature analysis shows how your jawline sits next to the rest of your face.
Jawline Gum vs. Jaw Exercisers vs. Mewing
Jawline gum, jaw exercisers and mewing all promise a sharper jaw without surgery, and none has research showing it delivers. Gum and exercisers train the same chewing muscles, while mewing is a tongue-posture habit. What differs is the risk.
Method | What it targets | What's known | Main risk |
|---|---|---|---|
Jawline gum | Chewing muscles, with very hard gum | One trial of typical gum: stronger bite, no change in jaw shape. No research behind jaw-sharpening claims for mastic gum | Jaw pain, headaches, clenching |
Jaw exerciser | The same chewing muscles, biting a silicone device | No solid evidence; a small Cureus case report saw no change in the jawline | Overworking the same muscles and jaw joints |
Mewing | Tongue posture, no chewing | The American Association of Orthodontists says there is no scientific evidence it reshapes the jawline | Loosened teeth, bite changes, tooth wear, speech problems (per the AAO) |
More detail: whether jawline exercisers work and what mewing can and can't do.
FAQ
Does jawline gum actually work?
Not for a sharper jawline. It can strengthen your chewing muscles, but in the 2024 trial six months of chewing didn't change masseter thickness or jaw shape, and a specialist quoted by Science News says there is no research behind the jaw-sharpening claims.
Is jawline 100% genetic?
No. Bone structure is mostly genetic, but body fat, skin and age also change how defined a jawline looks. Losing a little weight can make a visible difference, according to a facial plastic surgeon quoted by Popular Science.
Is it bad to chew gum every day?
It depends on how much and how hard. A 2025 study of young adults found no link between gum chewing and jaw joint disorders, but hours of hard gum haven't been tested. The NIDCR lists gum chewing among habits to cut back on if you have a jaw joint disorder. If you get jaw pain, clicking or headaches, stop and see a dentist.
Can chewing gum help sagging jowls?
There's no evidence it does. Sagging comes from loose skin and fat, and the chewing muscles don't affect skin tightness. A small Cureus case report saw no face or neck tightening from a jaw exerciser.
Can chewing gum reduce a double chin?
No. Exercising a muscle doesn't burn the fat over it, and a meta-analysis of localized exercise training found no spot reduction.
Which gum is best for a jawline?
No gum has been shown to improve a jawline, so none can be called the best for it. Harder gums only put more load on your jaw muscles and joints.
Does jawline gum work for teens?
Teens are the main target of the trend, but the evidence is the same: no research behind the jaw-sharpening claims. A dermatologist quoted by CBS Pittsburgh advises teens to wait, since most will see more definition naturally in their 20s and 30s.
How long should I chew gum for a jawline?
No duration has been tested, so any number you see online is a guess. Long sessions are also the ones linked to jaw pain and headaches.
Sources
Can chewing gum reshape your jawline? We asked experts (Popular Science)
Temporomandibular disorders (TMD) (National Institute of Dental and Craniofacial Research)
Association between gum chewing and temporomandibular disorders (Journal of Clinical Medicine, 2025)
Doctors skeptical about mastic gum TikTok trend (CBS Pittsburgh)
Facial contouring through jaw exercises: a report of two cases (Cureus, 2024)
American Association of Orthodontists warns against popular "mewing" trend (AAO press release)
