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By Christian Arnold·Updated August 29, 2025

Can you really grow your jawline with mastic gum?

“Experts” are quick to debunk claims that chewing gum can grow your jaw muscles, thus improving facial attractiveness… but evolutionary biology and anecdotal evidence say otherwise.
Side profile of man dropping mastic gum into his mouth
Is chiseling your jawline as simple as chewing the right gum?Photo by Greco Gum.

Addressing the allegations

It’s no wonder mainstream experts like dentists and orthodontists are quick to dismiss claims that come from the online alternative health and “looksmaxxing” communities: they’re littered with fraud and scams!

That, and these experts are too deeply devoted to the dogma they learned in dentistry school, may have monetary incentives to debunk natural cures, and can’t stand when laymen think they know better than them, especially if they’re teenage TikTokkers. “Don’t confuse your Google search with my medical degree!”

A doctor with a stethoscope around his neck crosses his arms
Trust in medical institutions dropped 30% during the pandemic. Photo by Kaboompics.

Some of these grifts in the health world are just silly, only draining your wallet, time, and effort (think detox teas and healing crystals), while others are more nefarious and dangerous, threatening these things on top of your most valuable assets: your mental and physical health.

When it comes to scams in the jawline gum world, we’re talking the majority of Greco Gum’s competition—plastic, carcinogenic, testosterone-lowering slop sold off as “gum”. In terms of BS in the looksmaxxing community, you’ve got:

  • Starving yourself to achieve the coveted hollow cheek look
  • Leg-lengthening surgery to increase height—gotta get to 6 feet somehow, right?
  • Bonesmashing your face with hard objects to get more pronounced cheekbones
  • And The Blackpill: the belief that unless you’re born looking like Brad Pitt, you’re doomed to be a loser for life, so you should either give up now or go all in on plastic surgery and these other crazy methods
Side-by-side of two young men using massage guns on their jaws
The stupidity of looksmaxxers knows no bounds. Photos by Today Online.

But as whack as some of these ideas are, let’s not throw the baby out with the bathwater—looksmaxxing is directionally accurate, as physical appearance is a huge factor in self-confidence and success. Furthermore, techniques like mewing and chewing mastic gum for jawline enhancement are safe and effective, and should be evaluated fairly, away from their bogus, bonesmashing,* blackpilling* counterparts.

To prove this, we’ll evaluate an article from the experts that “debunks” the idea that you can grow your jaw muscles by chewing, explaining where they go wrong, and the true scientific mechanism behind jaw growth; to finish off, we’ll cover the many other benefits of chewing mastic gum or ingesting mastic powder capsules beyond jawline gains.

Why the experts are wrong about mastic gum

According to the popular health information site Healthline, “chewing gum, Jawzrsize, and mewing may give your facial muscles a slight workout, but they’re unlikely to create visible changes to your jawline. It’s not possible to target fat loss in any particular area. Additionally, the appearance of your jaw depends on your genetic bone structure.” 1

Surprisingly, they get a few things right here:

  • Yes, Jawzrsize devices are BS (but not exactly because they don’t work, rather because they poison you with microplastics)
  • It’s not possible to target fat loss in a specific area
  • Your facial appearance is largely determined by your genetic bone structure (but even that is malleable to some extent)

Mistake #1

Healthline drastically underplays the amount of muscle you can put on in your jaw muscles (the masseters), which are the largest and strongest muscles out of the dozens in the face, as they’re primarily responsible for chewing.

Mistake #2

Healthline makes another blunder when they claim “chewing gum isn’t likely to sharpen or define your jawline because the muscles used for chewing are largely in the neck and cheeks.”

This is half true but misleading because technically, yes, there are more muscles used in chewing in the neck, but these are accessory muscles that aren’t directly involved in opening and closing the jaws like the masseters, the temporalis, and the lateral and medial pterygoids, which are located in the jaw area and do the vast majority of the work when chewing.

Plus, nobody’s looking for well-defined mylohyoid muscles—we just want to mogg with our massive masseters, right? It’s a complete cope and a blatant red herring.

Diagram of muscles used when chewing
The 4 primary muscles used in chewing. Photo by Wikimedia Commons.

The masseter-muscle-maxxing mechanism

As with all of the other major muscles in the body that are designed to be heavily load-bearing—as opposed to minor accessory muscles—we can grow the masseters and tone the jawline through resistance training to stimulate hypertrophy.2

Brad Pitt posed with large jaw muscles
Chew Greco Gum for a legendary jawline like Brad Pitt. Photo by Matt Baron.

To achieve masseter hypertrophy and grow gills like Brad Pitt, we recommend chewing mastic gum in sessions of 15-30 minutes, or passively throughout the day—starting with a large nugget and then supplementing with smaller droplets as needed to achieve your desired texture. After chewing mastic for a while, you may also notice subtle gains in your temple muscles, giving you that giga-brain look to go along with your giga-chad jawline.

Check out what our good friend Marcel accomplished when he integrated chewing Greco Gum’s mastic gum daily for a year straight into his fitness routine. Sure, he put on a muscle elsewhere, but the structure of his face undeniably changed drastically thanks to the growth of his masseters and toning of the jawline from chewing mastic gum.

Before and after pictures of a man’s jaw transformation with Greco Gum
Unretouched jaw transformation of Marcel Schaar, who chewed mastic gum every day for 1 year. Photos by Marcel Schaar.

Additionally, chewing tough foods and tough mastic gum will also strengthen your actual jaw bones, working via Wolff’s Law, which states that bone adapts to the stress it’s placed under—also the reason MMA fighters have dense shin bones and the hypothetical mechanism behind bonesmashing. 3 For a deeper dive into the science and more case studies, click here.

Historical Evidence: Weston A. Price

But this isn’t all just theory or something we’ve spun up to sell more gum. Chewing tough foods is an important part of facial development, confirmed by archeological and anthropological evidence.

In the early 1900s, Canadian dentist Weston A. Price researched native populations around the world, showing their jaws became recessed and smaller with their teeth crowding in within one generation of introducing a soft, westernized, industrial diet—as opposed to their natural diets, which were filled with meats and plants that required rigorous chewing from a young age.4

Early 1900s comparisons of the smiles and jaws of pre-industrial vs. industrial populations
Chewing is a crucial activity for facial development. Photo by Weston A Price.

The negative changes made to our faces as a result of softer diets are not only detrimental to our appearance in face shape and teeth, but also to our airway health, which affects the state of our nervous system and energy supply to every cell in our body. The only cures? Proper breathing mechanics, focusing on mitochondrial health, and more meat and mastic gum.

What else does mastic gum work for?

Beyond jaw growth, mastic gum has many medical uses that the Greeks of the island of Chios and the rest of the Hellenic World enjoyed for millennia. Now, we have the scientific means to back these benefits up.

A tin of Greco Gum mastic gum perched atop a beach on Chios, Greece
Chios, Greece, the home of mastic gum. Photo by Greco Gum.

Chewing mastic gum may:

  • Reduce plaque & bacterial overgrowth in the oral and gut microbiomes
  • Help eliminate H. pylori and other stomach ulcers
  • Stimulate saliva production & digestive motility
  • Help fight Crohn’s disease and other forms of IBD
  • Support sperm production
  • Help fight cancer
  • Help with blood sugar regulation
  • Reduce bad cholesterol and the risk of heart disease

Knowing all this and how effective mastic gum is for building jaw muscle, the question changes from “does mastic gum work?” to “what can’t mastic gum do?” The only logical next step is to invest in the cleanest, highest-quality, most effective mastic gum you can get your hands (and teeth) on and see for yourself.

References

  1. Cronkleton, Emily. “Does Chewing Gum Help Your Jawline? Facts and Myths.” Healthline, July 22, 2021. Healthline.com.

  2. “Muscle Hypertrophy.” In Muscle Hypertrophy – an Overview, ScienceDirect Topics. Accessed n.d. sciencedirect.com.

  3. Frost, Harold M. “Wolff’s Law and Bone’s Structural Adaptations to Mechanical Usage: An Overview for Clinicians.” The Angle Orthodontist 64, no. 3 (1994). PubMed.

  4. Price, Weston A. Nutrition and Physical Degeneration. Price-Pottenger Nutrition Foundation, 2020.