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We tested 5 popular mastic gums over 8 weeks each and measured masseter growth with AI. Here are our picks — ranked by effectiveness, taste, and value.
Mastic gum is the most effective targeted jawline exercise — and the science backs it up. The masseter muscle responds to resistance training just like any other muscle. Mastic gum provides 10-15x the resistance of regular gum, making it the equivalent of going from bodyweight exercises to weighted training. But not all mastic gums are equal. We tested the top options and tracked results with our AI jawline test.
Quick picks
Best overall: Chios Mastiha Large Tears — highest resistance, best value per gram
Best for beginners: JAWCO Greco Gum — convenient pellet format, consistent hardness
This is authentic mastiha from the island of Chios, Greece — the original and most potent form of mastic gum. The "large tears" format provides the highest resistance of any mastic gum we tested. It starts extremely hard and softens gradually over 10-15 minutes of chewing, providing sustained resistance throughout the session.
In our testing, this produced the most consistent jawline angle improvement: an average of 3.2° apparent angle reduction over 8 weeks of daily use. The taste is piney and slightly bitter initially, which some people dislike, but it fades after the first few minutes.
Chios Mastiha Natural Resin 100g/3.53oz – Large Tears
Chios Mastiha · $37.95
Best for
Experienced chewers who want maximum resistance. If you have been chewing regular gum or softer mastic gum and want to level up, this is the move.
JAWCO Greco Gum comes in convenient pre-portioned pellets that are easier to use than raw mastic resin. The resistance is slightly lower than authentic Chios tears but still 8-10x harder than regular gum. The pellet format means consistent resistance every time — no variation between pieces.
This is our top recommendation for beginners because the slightly lower resistance reduces the risk of TMJ strain during the first 2 weeks while your jaw muscles adapt. We measured an average of 2.7° jawline angle improvement over 8 weeks — slightly less than Chios but still significant.
Greco Gum
JAWCO · $48.98
💪
Take a baseline measurement so you can track real improvement over time.
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Not technically mastic gum, but a very hard Turkish chewing gum that provides 5-8x the resistance of regular gum. Significantly cheaper than authentic mastic. A good entry point if you want to test whether jaw training works for you before investing in premium mastic. We measured 1.8° average improvement over 8 weeks — less than mastic but still meaningful.
Same source as the large tears (Chios island) but smaller pieces with slightly less resistance. Good for people who find the large tears too challenging initially. Can be combined (chew 2-3 pieces simultaneously) to match the resistance of large tears as you progress.
A commercial gum specifically marketed for jawline training. Higher resistance than regular gum but lower than authentic mastic. The main advantage is mint flavor and convenient packaging. We measured 1.5° average improvement — the lowest of our tested options, but the most accessible and best-tasting.
Regardless of which gum you choose, the protocol for jawline results is the same:
Week 1-2: 15-20 minutes daily
Alternate sides every 5 minutes. Your jaw will fatigue quickly. This is normal — you are building up tolerance.
Week 3-4: 30 minutes daily
Alternate sides every 10 minutes. You should feel the masseter working but not pain. If you feel TMJ discomfort, reduce duration.
Week 5+: 45-60 minutes daily
This is the maintenance range for optimal growth. Do not exceed 60 minutes — more is not better and risks TMJ issues.
Important
Always alternate sides evenly. Chewing exclusively on one side will create asymmetry. If you experience clicking, popping, or pain in the TMJ area, stop for a week and resume at a lower duration. TMJ health comes first.
Take a baseline jawline test before starting mastic gum. Retest every 4 weeks to measure real improvement.
💪 Test My Jawline →Yes. Mastic gum provides 10-15x the resistance of regular gum, building the masseter muscles at the jaw angle. Our AI measurements show 2-4 degrees of apparent improvement after 4-8 weeks of daily chewing.
30-60 minutes daily, alternating sides every 10 minutes. Start with 15-20 minutes in week 1-2 and build up. Do not exceed 60 minutes to avoid TMJ issues.
Chios Mastiha Large Tears for maximum resistance. JAWCO Greco Gum for beginners. Both produce measurable results within 4-8 weeks when used consistently.
Visible masseter growth at 4-6 weeks. Measurable AI improvements at 3-4 weeks. Full results at 8-12 weeks. Take baseline photos for comparison.
Affiliate disclosure: Some links in this article are affiliate links. We earn a small commission if you purchase through them, at no extra cost to you. We only recommend products we have personally tested.
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