ST6, known in traditional Chinese medicine as Jiache, is an acupuncture point located on the jaw at the belly of the masseter muscle, the thick muscle you can feel bulging when you clench your teeth. It sits in one of the most nerve-dense regions of the face and is used primarily for jaw pain, facial nerve problems, teeth grinding, and temporomandibular joint (TMJ) disorders. The point has attracted research attention in recent years because the masseter muscle itself is a common source of orofacial pain, and needling or pressing ST6 appears to directly affect the tension and even the size of that muscle.
Where Exactly ST6 Is and How to Find It
To locate ST6, place your fingers on your jaw angle, the bony corner just below your earlobe, and clench your teeth. You will feel the masseter muscle pop outward. ST6 sits about one finger-width above and in front of that jaw angle, right in the thickest part of the muscle belly. In clinical terms, a meta-analysis of acupuncture for TMJ disorders describes it simply as being “on the belly of the masseter muscle,” which is the landmark most practitioners use.1Journal of Stomatology Oral and Maxillofacial Surgery. Efficacy of acupuncture in the treatment of temporomandibular disorders: a meta-analysis of randomised controlled trials When you press into that spot with moderate pressure, you may feel a deep ache or a sensation that radiates along the jawline. That tenderness is part of what makes the location useful: it often overlaps with a myofascial trigger point in the masseter.
One reason ST6 is so clinically relevant is the anatomy directly beneath it. A study using three-dimensional tissue reconstruction found that the local tissues at ST6 contain sensory nerve fibers, sympathetic nerve fibers, and parasympathetic nerve fibers all running together, though each type distributes independently to its own target tissues, including blood vessels, hair follicles, and the subcutaneous muscle layer.2PubMed Central. Sensory and autonomic innervation of the local tissues at traditional acupuncture point locations GB14, ST2 and ST6 In plain terms, the point sits where all three branches of your body’s nerve-signaling system converge, which may explain why stimulating it can produce both local muscle relaxation and broader effects on pain perception.
Jaw Pain and TMJ Disorders
The most common clinical use for ST6 is in treating pain and dysfunction of the temporomandibular joint, the hinge that connects your jaw to your skull. TMJ problems cause aching around the ear, difficulty chewing, clicking sounds, and sometimes locking of the jaw. Because the masseter muscle is one of the primary muscles involved in chewing and clenching, and because it attaches right at the TMJ, needling its belly at ST6 can directly address the muscular component of the problem.
A meta-analysis of randomized controlled trials on acupuncture for TMJ disorders noted that needling Jiache (ST6) “can directly release trigger points and alleviate muscle hypertonia,” meaning it helps the chronically tightened masseter relax.3Journal of Stomatology Oral and Maxillofacial Surgery. Efficacy of acupuncture in the treatment of temporomandibular disorders: a meta-analysis of randomised controlled trials In a clinical study of twenty patients with TMJ disorders treated with laser acupuncture at ST6, ST7, an ashi (tender) point, and LI4 on the opposite hand, seventeen patients showed pain relief. Their average pain score dropped from about 6.3 to 2.5 on a 10-point scale, representing roughly a 63% reduction in pain.4ScienceDirect. Clinical effectiveness of laser acupuncture in the treatment of temporomandibular joint disorder That is a meaningful improvement, though the study was small and lacked a sham control group, so it is hard to separate the effect of needling from placebo response.
What makes the TMJ evidence interesting is that multiple approaches at ST6 seem to produce results. Some practitioners needle it manually, others apply electrical stimulation, and this laser study used a non-penetrating light source. The consistent thread is that the point’s location on the masseter muscle belly gives direct access to a muscle that is often the root of TMJ-related pain.
Bruxism and Teeth Grinding
Bruxism, the involuntary grinding or clenching of teeth, is closely related to TMJ problems but represents a distinct condition. It often happens during sleep, and chronic bruxism can wear down tooth enamel, cause headaches, and leave the jaw muscles sore every morning. ST6 appears frequently in acupuncture protocols for bruxism, though the evidence here is thinner than for TMJ pain.
A scoping review of traditional medicine treatments for bruxism found several studies using ST6. One study used pharmacopuncture (injecting a small amount of herbal solution) at ST6 and another nearby point for ten days and reported a 50% effectiveness rate. Two other case series applied electrical stimulation at ST7 and ST6, reporting effectiveness rates of about 28% and 45%.5Journal of Traditional Chinese Medical Sciences. A scoping review on traditional medicine for bruxism Those numbers are not overwhelming, and the studies were small case series rather than rigorous trials. Bruxism is a notoriously difficult condition to treat, and even pharmaceutical approaches have mixed success, so these modest results are worth noting without overstating them.
The rationale for using ST6 in bruxism is similar to its use in TMJ disorders: the masseter is the main muscle doing the clenching, and ST6 sits right on it. If you can reduce the muscle’s baseline tension or interrupt the nerve signals that drive involuntary contraction, grinding may decrease. Whether acupuncture at this point can produce lasting changes in a habit that often has stress-related and neurological drivers is still an open question.
Trigeminal Neuralgia and Severe Facial Pain
Trigeminal neuralgia is one of the most painful conditions known, producing electric-shock-like pain along one side of the face. It is caused by irritation or damage to the trigeminal nerve, the major nerve supplying sensation to the face. Standard treatment involves anticonvulsant medications like carbamazepine, but some patients do not respond well to drugs or cannot tolerate the side effects.
A published case report described a patient with drug-resistant trigeminal neuralgia who was treated with acupuncture at ST6, ST7, and several distal points. After the treatment course, the patient experienced significant pain relief, and carbamazepine was gradually reduced and eventually stopped entirely. The neuralgia symptoms did not return during follow-up.6PubMed Central. Successful treatment of a resistance trigeminal neuralgia patient by acupuncture A single case report does not prove that acupuncture at ST6 is an effective treatment for trigeminal neuralgia. But for a condition where some patients exhaust their pharmaceutical options, the report at least suggests an avenue worth studying further. The trigeminal nerve’s mandibular branch runs through the area around ST6, so there is an anatomical rationale for why stimulating this region might modulate the nerve’s pain signaling.
Bell’s Palsy and Facial Nerve Recovery
Bell’s palsy, a sudden weakness or paralysis of the muscles on one side of the face, is another condition where ST6 is commonly used. The condition is caused by inflammation of the facial nerve, and while most people recover on their own within weeks to months, some are left with lingering weakness. Acupuncture has a long tradition of being used for Bell’s palsy in East Asian medicine, and ST6 is one of the standard points in facial nerve treatment protocols.
A randomized controlled trial tested electroacupuncture combined with intradermal acupuncture for Bell’s palsy, using a protocol that included ST6 as one of the main acupoints. Electrical stimulation was applied between ST6 and ST4 (a point near the corner of the mouth) and between two other facial points, for 30 minutes per session.7PubMed. Electroacupuncture combined with intradermal acupuncture for Bell’s palsy: a stratified randomized controlled trial based on facial paralysis severity The pairing makes anatomical sense: ST6 and ST4 sit along the path of the facial nerve’s buccal and marginal mandibular branches, so running a mild electrical current between them may help stimulate the nerve and the muscles it controls. This approach to facial nerve rehabilitation is one of the more actively researched uses for ST6.
Why ST6 Is Often Paired with LI4
If you look at acupuncture protocols for jaw or face conditions, you will almost always see ST6 paired with LI4, a point located on the hand in the fleshy web between the thumb and index finger. This pairing has been used for centuries, but a brain imaging study offered a modern explanation for why it might work. Researchers used fMRI to compare brain activity when ST6 was stimulated versus when LI4 was stimulated, and found that the two points activated broadly overlapping brain regions, including areas involved in processing facial sensation like the postcentral gyrus and areas involved in motor control of the face.8PubMed Central. Specific Correlation between the Hegu Point (LI4) and the Orofacial Part: Evidence from an fMRI Study
In practical terms, LI4 is considered a “distal” point for the face and jaw: it is far from the face anatomically but shares nerve pathway connections to the same brain regions that process facial input. The idea is that combining a local point (ST6, right on the problem area) with a distal point (LI4, which activates similar brain areas from a distance) produces a stronger therapeutic effect than either alone. This local-plus-distal strategy shows up in most of the clinical studies discussed above, from the TMJ laser acupuncture protocol to the Bell’s palsy electroacupuncture trial.
Masseter Muscle Volume and Cosmetic Applications
An unexpected angle on ST6 has emerged from cosmetic medicine. In some individuals, the masseter muscle becomes enlarged, a condition called masseter hypertrophy, giving the lower face a square or wide appearance. Botulinum toxin injections into the masseter are a popular cosmetic treatment to slim the jawline by shrinking the muscle. The injection sites for botulinum toxin in this procedure are near acupuncture points ST5 and ST6, both innervated by the mandibular nerve.9Aesthetic Surgery Journal Open Forum. Effect of Facial Acupuncture Stimulation: MRI-Based Masseter Muscle Volume Analysis and Questionnaire Evaluation
A study using MRI to measure masseter muscle volume before and after facial acupuncture found significant reductions in muscle volume following treatment, likely because acupuncture improved muscle tension. The researchers noted that one comparative trial found no significant difference in pain reduction between botulinum toxin injections and acupuncture for myofascial TMJ pain, suggesting the two approaches may work through partially overlapping mechanisms: botulinum toxin blocks the chemical signal that makes the muscle contract, while acupuncture may reduce the chronic nerve-driven tension that keeps the muscle enlarged.10PubMed Central. Effect of Facial Acupuncture Stimulation: MRI-Based Masseter Muscle Volume Analysis and Questionnaire Evaluation The study’s authors pointed out that cosmetic acupuncture, TMJ treatment, and botulinum toxin treatment share insertion sites, suggesting that masseter volume reduction from acupuncture may be a real and measurable effect rather than just subjective improvement.
This is still early research, and nobody is claiming acupuncture at ST6 replaces botulinum toxin for jawline contouring. But it raises an interesting possibility for people who want to address masseter tension without injections, and it gives a concrete, measurable outcome (muscle volume on MRI) that goes beyond self-reported pain scores.
Applying Pressure to ST6 Yourself
You do not need an acupuncture needle to stimulate ST6. Acupressure, which uses finger pressure instead of needles, is the most accessible way to work with this point at home. To do it, find the masseter muscle by clenching your teeth and feeling for the bulge along your jaw. Place your thumb or index finger on the thickest part of the muscle, roughly one finger-width above and forward from the angle of the jaw. Apply steady, firm pressure for 30 seconds to a minute, then release. You can repeat several times. Some people find small circular motions more comfortable than static pressure.
The sensation should be a deep, achy pressure, not sharp pain. If you are pressing hard enough to cause sharp pain, ease up. People who carry stress in their jaw, wake up with sore teeth from nighttime clenching, or notice their jaw muscles feel tight during the day often find that pressing ST6 provides temporary relief. It is the same basic principle as massaging any tight muscle, but the location is specifically chosen because the masseter is often a primary driver of jaw and lower-face tension.
A few practical notes: pressing ST6 on both sides simultaneously can feel more balanced and comfortable than working one side at a time. If you have active TMJ problems, applying heat to the jaw area before pressing the point may help the muscle release more readily. And if you have a dental infection, recent jaw surgery, or unexplained facial swelling, skip the self-acupressure and see a clinician instead, since pressing into an inflamed area can make things worse.
The Trigger Point Connection
Western medicine has its own framework for understanding why pressing a specific spot on the masseter relieves pain: myofascial trigger points. These are hyperirritable knots within a tight band of muscle that can refer pain to other areas. The masseter is one of the most common muscles in the body to develop trigger points, and those trigger points often refer pain to the teeth, ear, eyebrow, and TMJ. The overlap between the location of ST6 and the most common trigger point site in the masseter is hard to ignore.
As the meta-analysis on acupuncture for TMJ disorders noted, needling ST6 “can directly release trigger points and alleviate muscle hypertonia.”11Journal of Stomatology Oral and Maxillofacial Surgery. Efficacy of acupuncture in the treatment of temporomandibular disorders: a meta-analysis of randomised controlled trials Whether you call it an acupuncture point or a trigger point, the tissue-level event is similar: a needle or sustained pressure applied to a taut band of muscle fibers can cause a local twitch response and then a release of tension. The neuroanatomical study showing rich sensory, sympathetic, and parasympathetic innervation at ST6 gives a plausible explanation for why that release might have effects beyond just the muscle itself, potentially influencing local blood flow and autonomic tone in the area.12PubMed Central. Sensory and autonomic innervation of the local tissues at traditional acupuncture point locations GB14, ST2 and ST6
This convergence between traditional acupuncture mapping and modern trigger point anatomy is one of the more intriguing aspects of ST6. It does not prove that traditional meridian theory is correct in the way it was originally conceived, but it does suggest that centuries of clinical observation identified a spot whose anatomical significance modern imaging and dissection studies are now confirming from a different direction.
What the Evidence Does and Does Not Support
The research on ST6 is strongest for TMJ-related muscular pain, where the rationale is straightforward: the point sits on the muscle causing the problem, and treating it reduces pain and tension. The evidence for bruxism is weaker, with only small uncontrolled studies showing modest effectiveness rates. For trigeminal neuralgia, there are intriguing case reports but no large trials. For Bell’s palsy, ST6 is part of multi-point protocols being tested in randomized trials, so stronger evidence may be coming. And for cosmetic jawline contouring, the MRI data on masseter volume reduction is genuinely interesting but very preliminary.
One pattern worth noting across all these conditions is that ST6 is rarely used alone. Nearly every clinical protocol pairs it with ST7 (just in front of the ear, over the TMJ itself), LI4 (on the hand), and often ST4 (near the mouth corner). That makes it difficult to isolate the contribution of ST6 from the effects of the full point combination. The fMRI evidence of overlapping brain activation between LI4 and ST6 suggests these points may genuinely potentiate each other, but it also means claiming that ST6 alone produces specific clinical outcomes overstates what the research actually shows.13PubMed Central. Specific Correlation between the Hegu Point (LI4) and the Orofacial Part: Evidence from an fMRI Study
For self-acupressure, the bar is lower. You are not trying to treat trigeminal neuralgia at home. You are trying to release a tight jaw muscle, and pressing a spot directly on that muscle with moderate pressure is about as low-risk and mechanistically straightforward as it gets. The clinical research provides context for why the spot was chosen and what it can do in trained hands; for everyday use, the principle is simple: if your jaw is tight, pressing where it is tightest tends to help.