Strengthening your jaw comes down to building the same muscles you use every time you chew, clench, or open your mouth. The primary muscles involved are the masseter (the thick muscle you can feel bulging at the back of your jaw when you bite down), the temporalis (which fans across the side of your skull above your ear), and the pterygoid muscles deeper inside. The average adult bite force sits around 285 Newtons for men and 254 Newtons for women, and targeted exercises can increase that force while also giving the jawline a more defined appearance.
The Muscles That Control Jaw Strength
Your jaw is powered by a group of muscles with complex shapes and large attachment areas, which means they can produce force in many different directions. The masseter and temporalis do the heavy lifting when you bite down, while the pterygoid muscles handle side-to-side and forward movements. Different portions of each muscle contribute different amounts of force. The posterior (rear) fibers of the deep masseter and temporalis, along with the lateral pterygoid, have the greatest mechanical advantage, meaning they generate the most bite force per unit of effort.
This matters for training because no single exercise hits every part of these muscles equally. You need a mix of movements: biting down, opening against resistance, and sliding the jaw laterally. That variety recruits the full range of muscle fibers and builds balanced strength rather than overdeveloping one area.
Exercises That Build Jaw Strength
The following exercises come from a clinical protocol used by Cambridge University Hospitals. They require no equipment and can be done in a few minutes. Start with five repetitions of each and work up to ten over a couple of weeks.
Resisted Mouth Opening
Place one hand under your chin to create resistance. Open your mouth as wide as you can while pushing down against your hand. Hold for five seconds, then relax. This targets the muscles that depress and open the jaw, which are often neglected.
Isometric Clench
Press your teeth firmly together without any object between them. Hold for five seconds and release. This works the masseter and temporalis in their strongest contraction pattern. Keep the effort controlled; you’re building endurance, not trying to crack a walnut.
Lateral Slides
Move your jaw to the left and hold for five seconds, then repeat to the right. This engages the pterygoid muscles responsible for side-to-side movement. You can also move your jaw in a large circular motion, as if slowly chewing a piece of toffee, to work through the full range of motion.
Jaw Protrusion
Slide your bottom teeth forward so they sit in front of your top teeth. Hold for five seconds. This activates the lateral pterygoid in a way that normal chewing rarely does, building strength in the forward-thrust direction.
Consistency matters more than intensity. Doing these exercises once or twice daily for several weeks will produce noticeable changes in jaw endurance and muscle tone. Some people also chew sugar-free gum for 10 to 15 minutes a day as a low-level supplemental workout, though this is less targeted than the exercises above.
What About Mewing?
“Mewing” refers to deliberately resting your tongue flat against the roof of your mouth, a practice popularized online as a way to reshape the jawline. The idea has some anatomical basis. A study at Loma Linda University found that people who naturally rest their tongue in a high position tend to have different facial proportions than those with a low tongue posture: narrower gonial angles (the corner of the jaw), higher ratios of posterior-to-anterior facial height, and wider upper jaws relative to their lower jaws.
However, the researchers were careful to note that this is an association, not proof of cause and effect. The study did not show that consciously changing your tongue posture as an adult will restructure your bones. Skeletal remodeling is far easier during childhood and adolescence, when the bones of the face are still growing. For adults, mewing is unlikely to reshape bone, though maintaining proper tongue posture can support better breathing patterns and may complement other jaw exercises by keeping the muscles in a more active resting state.
Jaw Exercise Devices: Proceed With Caution
Silicone or rubber bite-resistance devices are marketed as jaw trainers, with resistance levels ranging from 20 to 40 pounds of force. While the concept of progressive resistance is sound for most muscles, the jaw joint is unusually vulnerable. Researchers have warned that repeated use of these devices places far more stress on the temporomandibular joint (TMJ) than normal chewing. The concern is significant wear on the articular disc, which is the small cartilage pad that cushions the joint. That wear can trigger clicking, grinding sounds (crepitus), pain, or even complete disc dislocation.
The researchers compared the repetitive stress from these devices to what happens in people who grind their teeth at night, noting that users may end up needing treatment to calm down an overworked masseter. If you already have any TMJ symptoms, such as clicking, popping, or jaw pain, resistance devices are especially risky. The bodyweight exercises described above offer a safer path to the same goal.
Clinical Reasons to Strengthen Your Jaw
Jaw strengthening isn’t only cosmetic. Myofunctional therapy, a clinical approach that trains the muscles of the mouth and face, is used to treat several real medical conditions. Cleveland Clinic describes it as a way to retrain abnormal muscle movement patterns that affect breathing, chewing, swallowing, and speaking.
People with obstructive sleep apnea sometimes benefit from jaw and tongue strengthening because the soft tissues in the head and neck can press on the airway during sleep. Strengthening those muscles helps keep the airway open. Myofunctional therapy is also used for chronic mouth breathing, which can lead to sleep disruption and long-term health effects, and for TMJ disorders where weak or imbalanced muscles contribute to pain and dysfunction.
If your interest in jaw strength goes beyond appearance, particularly if you snore heavily, wake up with a dry mouth, or have difficulty swallowing, a myofunctional therapist can design a program tailored to your specific issue. These therapists are typically speech-language pathologists or dental hygienists with specialized training.
How to Structure a Routine
A practical daily routine takes about five minutes. Perform the resisted opening, isometric clench, lateral slides, and jaw protrusion exercises in sequence, holding each for five seconds and repeating five to ten times. Do this once in the morning and once in the evening. You can add a 10-to-15-minute session of gum chewing on your non-dominant side to address any strength imbalances.
Expect to feel mild fatigue in the muscles along the side of your face after the first few sessions. That’s normal. Sharp pain, clicking, or a sensation of the jaw catching or locking is not normal, and you should stop and reassess. Most people notice improved muscle tone and endurance within three to four weeks of consistent practice. Visible changes to jawline definition take longer and depend heavily on body fat percentage, since even well-developed masseter muscles won’t create a sharp jawline if they’re covered by a layer of subcutaneous fat.