You spend hours in the gym building your chest, your back, and your legs. Yet, your face—the one thing everyone sees first—is completely untrained. The Jawzrsize Athletic Bundle claims to be the “dumbbell for your face,” promising a chiseled jawline and reduced double chin through progressive resistance. Is this a legitimate tool for masseter hypertrophy, or just a viral silicone chew toy?
This review separates the physiological reality from the “face yoga” marketing hype.
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Important: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Excessive use may lead to TMJ or jaw pain. Always consult with a healthcare provider or dentist before starting a facial exercise regimen.
Jawzrsize Overview: What Are You Actually Buying?
Jawzrsize operates on a simple principle: your jaw (masseter) is a muscle. If you load it with resistance, it grows. The Athletic Bundle is designed for progression, moving you from “novice chewer” to “heavy lifter.”
The Bundle Breakdown:
- Pop N Go (Green/Beginner): Ready to use out of the box. Lower resistance (approx. 20-30 lbs). Think of this as your warm-up set.
- Custom Fit (Blue/Advanced): Requires boiling and biting to mold to your teeth strips. Higher resistance (40+ lbs). This is the working set.
- The Goal: To widen the jawline by hypertrophying the masseter muscles and tighten the skin under the chin through blood flow and toning.
The Physiology: Does Chewing Silicone Actually Work?
Let’s cut through the “face yoga” fluff. Does this change your face structure?
The “Yes” (Muscle Growth):
The masseter muscle is one of the strongest in the body. Like your biceps, if you overload it with resistance reps, it will undergo hypertrophy (growth). A larger masseter creates a wider appearance at the corner of the jaw.
The “No” (Spot Reduction):
You cannot chew away a double chin if you are at 30% body fat. While the device claims to “tone” the neck area, you cannot spot-reduce fat. You need a caloric deficit for that. Jawzrsize builds the muscle *under* the fat.
“Mechanically, it works. It’s resistance training for the face. However, volume management is critical. The jaw joint (TMJ) is delicate. You wouldn’t bench press for 4 hours straight; don’t chew this for hours either. Treat it like a workout: strict sets, reps, and rest.”
— Eugene Thong, CSCS
The Safety Check: TMJ & Teeth
This is the elephant in the room. Is Jawzrsize safe?
- The TMJ Risk: The temporomandibular joint is complex. Overusing high-resistance chewers can cause clicking, pain, or locking. Start slow.
- Teeth Protection: The “Custom Fit” models have bite strips to protect your enamel. Never chew directly on the hard silicone core without the strips.
- The Drool Factor: You will drool. A lot. Do this in the shower or alone in your car. It’s not a social activity.
Who Jawzrsize Is For (And Not For)
Perfect For:
- The “Weak Jaw” Struggle: Men with narrow faces looking to add muscular width to the mandible area.
- The Stress Chewer: If you grind your teeth or chew pen caps, this is a safer, structured outlet for that nervous energy.
- The Post-Diet Finisher: You’ve lost the weight, now you want to tighten the underlying musculature.
NOT For:
- TMJ Sufferers: If your jaw already clicks or hurts, stay away. Do not pass go.
- The “Magic Pill” Seeker: If you are overweight, this will just build muscle under your fat. Fix your diet first.
- Brittle Teeth: If you have extensive dental work (veneers, loose crowns), consult a dentist first.
“Interestingly, chewing has a satiating effect. The mechanical action of chewing signals the brain that ‘feeding’ is happening, which can acutely lower cortisol and reduce sugar cravings. It’s a biohack for dieters struggling with oral fixation.”
— Charles Damiano, B.S. Clinical Nutrition
The Verdict: Valid Tool, If Used Wisely
Jawzrsize isn’t magic, it’s mechanics. If you want a wider, more muscular jawline and are willing to put in the reps (without destroying your joints), the Athletic Bundle is the best progressive system on the market.
The Iron Lexicon: Face Edition
- Masseter
- The primary muscle of mastication (chewing). It runs from the cheekbone to the lower jaw. Hypertrophying this muscle creates a square, wide look.
- TMJ (Temporomandibular Joint)
- The hinge connecting your jaw to your skull. It is susceptible to inflammation and overuse injuries from excessive or uneven chewing.
- Mewing
- A technique of proper tongue posture (pressing the tongue against the roof of the mouth) often combined with jaw exercises to improve facial structure.
- Boil-and-Bite
- The customization method used for the “Custom Fit” unit, similar to a sports mouthguard, ensuring the bite strips match your specific dental alignment.
