Does chewing gum help your jawline? (What changes vs. what doesn’t)

Yes, chewing can make your jawline look more defined, mainly by growing the masseter muscle. But it only works if the gum is hard enough and you ramp up safely, chewing consistently long-term.

It won’t work overnight and certainly won’t melt face fat or magically remodel adult bone.

What determines jawline size and appearance?

“Jawline enhancement” is not a uniform concept, and several factors determine the appearance of your jaw; some are within our control and can be improved, while others are largely fixed for life.

Muscles grow when you stress them

Though many dentists and doctors are quick to debunk the claim that chewing gum can grow the jaw muscles, the simple fact is that muscles grow when you train them, and jaw muscles are no exception.

Think of it exactly like training your chest or legs: you wouldn’t expect bodybuilder-level growth from lifting the bar, right?

But in order to grow, our jaws require more resistance than what the typical soft modern diet and pathetic plastic chewing gum provides.

The muscles that matter for your jawline

Chewing mainly impacts the growth and appearance of the masseter muscles, which connect the lower and upper jaws.

Growing the masseters squares out the lower face from the front, and sharpens the angle of your jawline from the side to give you a more masculine appearance; in women, added masseter definition typically highlights cheekbones rather than over-masculinizing the face.

Though the masseters are the largest and strongest muscles in the face, the temporalis muscles (lining the sides of the head) also assist in chewing and will grow when trained to add thickness to the head.

Other muscles are also stimulated when you chew, such as the pterygoids (inner jaw) and buccinator (cheeks), but these are accessory muscles that are too small or deep to see growth in.

The key: hypertrophy requires resistance and consistency

The trick to actually growing your jaw muscles by chewing is using a gum that is tough enough to trigger hypertrophy: the process where muscles strengthen and enlarge by repairing microtears from repeated stress (e.g., lifting weights, chewing).¹

Although chewing-specific masseter hypertrophy is clinically understudied, strong evidence comes from patients with bruxism (chronic teeth clenching and grinding). Even without chewing anything, the prolonged forceful stress from bruxism alone visibly enlarges the jaw muscles.

Conversely, when Botox is injected to paralyze the masseters and stop unwanted activity, the muscles shrink, just as your biceps would atrophy after months away from the gym.²

As an extreme case, this proves how responsive the masseters are to sustained stimulation. Now imagine what they’d look like if they also chewed hard gum.

Why normal gum won’t do much for your jawline

It’s no wonder many are skeptical that chewing gum can change facial appearance. Regular gum is far too soft to provide meaningful stimulation.

For visible changes, you need to consistently chew hard gum. A compelling real-world example is Marcel Schaar, who chewed mastic gum, a 100% natural, extra-tough variety, every day for a year.

Marcel combined this with a rigorous fitness routine that dramatically lowered his body fat, revealing more of his underlying bone structure, but the hypertrophy in his jaw muscles is undeniable. When you consistently provide sufficient resistance over an extended period as part of a broader health regimen, the results are striking.

Mastic gum remains our top recommendation for effectively stimulating jaw muscles. Other gums and jawline devices on the market can also promote growth, but nearly all contain plastics and other harmful ingredients. Learn why mastic gum is the best option for a tough chewing gum capable of growing your jaw muscles here.

Now that you know jawline enhancement from chewing gum is possible, we’ll explore some common myths surrounding what gum can do for your face.

Will chewing gum change your bone structure?

During childhood, when bone is most malleable, chewing forces play a key role in facial development (along with factors like breastfeeding duration and allergies).³⁴

Archeological and anthropological evidence shows that early humans, who chewed tougher foods, developed larger skulls and stronger jaw muscles. Even after the advent of agriculture and softer foods, faces and jaws remained relatively wide, allowing teeth to grow in straight.⁵

It wasn’t until the Industrial Revolution and the widespread rise of highly processed foods that jaws became narrower, teeth more crowded and crooked, and facial aesthetics generally diminished across populations.

That said, don’t expect even the toughest gum to give you caveman-like jawbones as an adult. Chewing primarily builds jaw muscle mass and increases bone density, but it does not restructure bone to widen the palate (maxilla) or jaws.

Wolff’s Law?

Many cite Wolff’s Law, the principle that bone adapts to stress by adding new material, as proof that chewing hard foods or gum can reshape adult facial structure. In reality, chewing gum will not produce visible increases in bone mass; it only increases density.⁶

For example, Muay Thai fighters develop significantly denser shin bones from constant kicking, yet their legs look the same as yours or mine.

The underlying theory, however, is supported by strong animal data: a 2022 systematic review of 16 rat studies found that those fed hard pellets (versus soft powder) consistently developed visibly larger, thicker, and more squared jawbones across ages and durations of 1–7 months, with greater effects over longer periods.⁷

Can you spot reduce face fat by chewing gum?

High body fat, especially around the face and neck, is a major impediment to a well-defined jawline, but chewing gum cannot spot-reduce fat in these areas. At most, over time, chewing gum may tighten up the skin to a degree due to the increased muscle mass underneath, but if you’re overweight, there will be virtually no visible change from chewing alone.

Still, it’s a good idea to start a chewing routine alongside your diet and exercise routine to build those jaw muscles now, setting you up for an even more impressive reveal once you shed the extra pounds. Remember, lean is law.

Does chewing gum do the same thing as mewing?

Like chewing gum, practicing proper tongue posture, where the entire tongue is suctioned flat against the roof of the mouth (mewing), is commonly touted as a way to improve facial attractiveness.

This is because mewing temporarily accentuates the jawline and reduces the appearance of a double chin by physically raising the tissue under the jaw by raising the tongue. Long-term, this effect can be achieved passively once mewing becomes an unconscious habit, but the same benefits won’t come purely from chewing gum because different muscles are trained.

Even so, many myofunctional therapists use chewing tough gums like mastic in their protocols to strengthen the tongue, jaws, and surrounding facial muscles, thereby indirectly supporting tongue posture and other functions, leading to a better-looking face.

How to chew mastic gum

Mastic gum is practically the only safe, and actually health-promoting, chewing gum in existence that can provide enough resistance to trigger hypertrophy for your jaw muscles.

To start your jawline journey, you’ll want to go slow to avoid injury and give your muscles time to adapt. But remember, shocking the muscle is still key for growth, so we’ll build up to longer sessions with more gum for the best results.

Here’s an example protocol to get you going:
Chew mastic gum for 5-10 minutes 3-4x/week, ramping up slowly. Start with smaller, harder pieces and add in larger, softer pieces as your jaw adjusts. Once you’re comfortable with 10-minute sessions, you can graduate to up to 20 minutes every day.

See our guide for the full chewing gameplan.

Common mistakes when chewing mastic gum

Since your jaw is likely unaccustomed to prolonged chewing of hard gum, mild muscle soreness is expected in the beginning. But as with any new workout regimen, staying alert for signs of injury or dysfunction, such as jaw clicking, headaches, tooth pain, or excessive soreness, is key.

If any of these occur, stop chewing for a few days, then resume cautiously, monitoring your symptoms. If they persist, you may have an underlying TMJ issue that requires evaluation by a doctor.

Don’t worry, this doesn’t automatically disqualify you from chewing mastic gum; in fact, you might need to chew more. For more on mastic gum and TMJ, click here.

Most people can avoid these pitfalls entirely by starting slowly and following our recommended protocols. Before chewing gum for jaw growth, identify your preferred chewing side and consciously even out where you chew to ensure even muscle gains.

We understand the eagerness for fast results, but never confuse dysfunction, like clicking or pain, with progress.

Now that you’re ready to start your jawline journey, use our buyer’s guide to find a mastic gum that’s worth your hard-earned money.

Frequently asked questions

How long should you chew gum for jawline?

It depends on your level of experience and the strength of your jaw muscles, but you’ll want to start slow and work your way up. Beginners should chew as little as 15 min/day, while advanced users can chew freely if no issues arise.

Consult our chewing guide for specifics.

Does chewing gum make your jawline sharper?

Yes, growing the jaw muscles will make your jawline sharper, but it won’t change the angle of your jaw, only add muscle mass and tone as long as there’s minimal fat concealing it.

Does chewing gum make your face bigger?

Yes, regular chewing (especially with firm gum like mastic) hypertrophies the masseter and temporalis muscles, making the jaw and temples more prominent for a wider face. With low facial fat, this creates a toned, defined look rather than a bloated appearance.

Can chewing gum change your jaw bone?

In theory, chewing hard gums or foods can increase the density of your jaw bone, but visibly changing your bone structure is likely impossible in adulthood if chewing gum is your only method.

What if my jaw clicks or hurts when chewing?

Stop chewing for 2 days, and then re-evaluate slowly. If this persists, consult with a professional TMJ doctor for guidance. Find more info on mastic gum and TMJ here.

What’s the best gum for jawline training?

Mastic gum, an all-natural chewing gum from Greece, provides the jaw muscles with enough resistance to trigger growth without the plastics and other harmful chemicals found in other jawline gums.