Does Chewing Gum Help Your Jawline? What Studies Show
Roon Team
Does Chewing Gum Help Your Jawline? What Studies Show
Probably not in any way you can see. In the one randomized trial that measured it, 58 adults chewed gum three times a day for six months: bite force rose, but masseter thickness and jaw shape did not change. Your jawline is mostly bone structure and the fat over it, and heavy chewing can cause jaw pain, not a sharper profile.
Key Takeaways
- A 2024 randomized controlled trial found six months of gum chewing increased bite force but produced no change in masseter muscle thickness or mandibular shape.
- A separate trial in adults 65 and older showed a chewing-exercise device did increase masseter thickness, but participants were elderly with weakened muscles, and no one measured appearance.
- The masseter sits at the back corner of the jaw, near your ear. Making it bigger would widen your face, not sharpen the line under your chin.
- Heavy gum chewing is listed by the NIH as a habit to reduce if you have jaw-joint problems, and a small study linked daily gum chewing to chronic headaches in teens.
Does Chewing Gum Help Your Jawline? What the Studies Found
Two trials have tested whether repeated chewing changes jaw muscles. Only one used actual gum. Neither measured how anyone looked.
| Study | Participants | Protocol | What Changed | What Did Not Change |
|---|---|---|---|---|
| Jung et al. 2024 | 58 healthy adults, randomized | Gum chewing 3x/day for 6 months vs. no training | Bite force up at 3 months (p < .001); occlusal contact area up (p = .020) | Masseter muscle thickness; mandibular shape |
| Kim et al. 2020 | 40 adults aged 65+, randomized | Medical chewing-exercise device, 20 min/day, 5 days/week, 6 weeks | Bite force (p < .001); masseter thickness (p < .05 vs. control) | N/A (appearance not measured) |
Older adults with weakened chewing muscles gained thickness using a resistance device designed for rehabilitation. Healthy younger adults chewing ordinary gum for six months did not.
What Actually Makes a Jawline Look Defined
Three structures determine what you see.
The mandible. The bone itself. Its shape is mostly genetic, set during skeletal development. Jung 2024 measured mandibular shape at baseline and six months. It did not change.
Subcutaneous fat. The fat layer along the jawline and under the chin is what separates a visible jaw angle from a soft one. You cannot spot-reduce fat by working a muscle underneath it. Overall body composition is the lever.
The masseter. The main jaw-closing muscle, running from the cheekbone (zygomatic arch) to the angle of the lower jaw. It sits at the back corner of the jaw, in front of the ear. As coverage summarized by ADA News put it, tougher gum "may strengthen the masseter muscles, leading to a squarer or wider face shape without improving the undersurface of the jawline." The best-case outcome for gum is a wider lower face, not a sharper edge.
Does Mastic Gum or "Jawline Gum" Work Better Than Regular Gum?
No trial of mastic gum or branded "facial fitness" gum on jawline appearance exists in the published literature as of 2026. The marketing logic is simple: harder gum, more resistance, bigger masseters. The Kim 2020 result suggests higher loads can increase masseter thickness in people whose muscles are weak. But more load also means more stress on the temporomandibular joint.
Some facial fitness gums add caffeine and other ingredients, per ADA News coverage. If you want to understand how caffeinated gum actually works, that is a separate question from jaw shape. None of these additions have been tested for any jawline effect.
Is Chewing Gum Bad for Your Jaw?
It can be. The National Institute of Dental and Craniofacial Research (NIDCR) lists gum chewing among the habits to reduce as part of TMD self-care. TMD (temporomandibular disorders) affects about 5% of U.S. adults and is twice as common in women as in men.
Warning signs: pain in the chewing muscles or jaw joint, and painful clicking, popping, or grating when you open or close your mouth. Clicking without pain is common and considered normal by NIDCR's own description.
As ADA News coverage summarized: "Chewing excessively can lead to inflammation and jaw pain." If your jaw is sore from chewing gum, that is the joint telling you to stop. If pain or painful clicking continues, see a dentist. People who chew nicotine gum heavily report similar complaints.
Can Chewing Gum Give You Headaches?
One small study says yes, at least in teenagers. Watemberg et al. 2014 followed 30 adolescents (25 girls, median age 16) with chronic headaches who chewed gum daily. After stopping gum for one month, 26 reported improvement and 19 had their headaches resolve entirely. All 20 who started chewing again relapsed within days.
Limitations are real: 30 participants, no control group, teens only. But rapid improvement on stopping and rapid relapse on restarting is hard to dismiss if you are a teenager with daily headaches and a gum habit.
How Long Is It Safe to Chew Gum?
There is no official hourly limit. What the dental evidence supports is short sessions for oral health. The American Dental Association cites trials where sugar-free gum chewed for 20 minutes after meals lowered cavity rates by stimulating saliva, which helps neutralize acids on the teeth. The ADA recommends looking for the ADA Seal.
Twenty minutes after a meal is a dental tool. Hours a day for jaw size is where the pain reports, the headaches, and the TMD flare-ups come from. The line between those two things is worth respecting.
What Does Change a Jawline? Do Mewing or Jaw Exercisers Work?
The American Association of Orthodontists says there is "no current research that suggests the technique provides any benefit to your jawline or oral health." Risks include disrupted tooth alignment, bite problems, temporomandibular joint pain, and speech difficulties. Rubber jaw-exerciser balls load the joint the same way hard gum does, only harder. No verified trial on their jawline effect exists.
What does change the line you see? Lower overall body fat reduces the padding along the jaw and under the chin. Posture, and a beard, change how the jaw reads. Medical options exist: the FDA approved deoxycholic acid injection (Kybella) in 2015 for moderate-to-severe submental fat in adults. Those are conversations for a dermatologist or plastic surgeon.
If You Chew for Focus or a Habit, Not for Your Jaw
Many people chew for concentration, stress, or to replace a cigarette, vape, or dip. That is a different use case than chasing a jawline, and the evidence for gum and focus is more interesting than the evidence for gum and jaw shape. If you are curious about why the urge to keep your mouth busy exists, that is worth reading separately.
When the jaw starts complaining, the fix is not softer gum. It is something that keeps the mouth occupied without loading the joint: a mint, a lozenge, a pouch. There are alternatives to chewing gum that work for the oral habit without the repetitive stress. Even athletes who chew for nerves rotate formats when their jaws need a break.
Chew for Your Teeth, Not for Your Jawline
Six months of gum chewing, three times a day, did not change masseter thickness or mandibular shape in the only randomized trial that tested it. The masseter is in the wrong place to sharpen a jawline even if it did grow. Fat and bone determine what you see, and gum does not change either one. What gum does well, protecting teeth for 20 minutes after a meal, is a much smaller job than the internet wants it to be. If you chew, chew for your teeth. If your jaw hurts, stop.
Frequently Asked Questions
How long does it take for chewing gum to change your jawline?
The best evidence says it does not, at any timeline. In the Jung 2024 trial, 58 adults chewed gum three times a day for six months. Masseter muscle thickness and mandibular shape were unchanged. Bite force increased at three months, but stronger bite force is not visible on your face. No timeline for visible jawline change from gum is supported by published research.
Does chewing gum make your face wider or slimmer?
If anything, wider. The masseter sits at the back corner of the jaw near the ear. Even if heavy chewing made it measurably thicker (which the 2024 trial did not find), that would add width to the lower face, not remove fat from under the chin. As ADA News coverage summarized, tougher gum could lead to a "squarer or wider face shape without improving the undersurface of the jawline."
Does mastic gum help your jawline?
No trial of mastic gum on jawline appearance has been published. Mastic gum is harder than regular gum, so it loads the masseter more. Whether that translates to visible thickness gain in healthy young adults is untested. What is tested: six months of regular gum chewing did not change masseter thickness. Harder gum also means more force on the temporomandibular joint, which raises the risk of pain.
Can chewing gum cause TMJ problems?
The NIDCR lists gum chewing among habits to reduce for TMD self-care, and TMD affects about 5% of U.S. adults. That does not mean gum causes TMD, but it can aggravate an existing problem or contribute to jaw pain and inflammation in people who chew excessively. If you have painful clicking, popping, or grating in your jaw, see a dentist.
How many hours a day should you chew gum for your jawline?
No evidence supports any number. The dental use case, supported by the ADA, is 20 minutes of sugar-free gum after meals to reduce cavities. Chewing for hours a day to change jaw shape has no trial behind it and is where reports of jaw pain, headaches, and TMD symptoms come from. There is no safe dose for an outcome that does not happen.
Does chewing gum get rid of a double chin?
No. The muscles you use to chew (primarily the masseter and temporalis) are not under the chin. They are along the sides of the jaw and temple. You cannot spot-reduce fat by exercising a nearby muscle. A double chin is subcutaneous fat in the submental area, and the only things that reduce it are overall body fat loss or medical procedures like injectable deoxycholic acid. Gum does not belong in that conversation.
Something to Do With Your Mouth That Does Not Load Your Jaw
If you chew for focus or habit and your jaw is sore, the problem is the chewing, not the brand. Roon is a zero-nicotine, zero-sugar oral pouch (contains sucralose) that sits between lip and gum. No chewing, no jaw load. It delivers 80 mg caffeine, 60 mg L-theanine, 25 mg methylliberine (Dynamine), and 5 mg theacrine (TeaCrine). Onset is 5 to 10 minutes; felt duration is 6 to 8 hours. That duration comes from methylliberine slowing caffeine's clearance: a randomized crossover PK study (n=12) using 100 mg methylliberine with 150 mg caffeine found oral clearance dropped from 41.9 to 17.1 L/hr and half-life rose from 7.2 to 15 hours, with no higher peak. Roon's doses are lower (25 mg and 80 mg), so those numbers do not transfer directly, but the mechanism is the same. Stop at least 8 hours before bed.
Roon will not change your jawline. It keeps your mouth occupied without loading the joint. From $9.16 per tin on subscription; one-time 4-tin orders are $15.00 per tin. If you chew for the habit, not the jaw, it is worth trying.
Related from Roon
- Does Chewing Gum Help You Focus?
- Alternatives to Chewing Gum: A Complete Guide
- Oral Fixation: What You Need to Know
- Energy Gum vs. Pouches for Focus
Written by Roon Team
