Yinjiao

What is GV28?

GV28 (Yinjiao) is the final point of the Governing Vessel channel, sitting inside the upper lip where the lip frenulum meets the upper gum.

It is one of the few classical points that lies inside the mouth. Its Chinese name, Yinjiao, is usually translated as "gum intersection", which simply describes where it is. Classical texts group it with points for the gums, mouth, nose and face.

Two things worth knowing before you go further. First, a point having two thousand years of tradition behind it tells you that people have used it for a long time. It does not tell you that it works, and it does not tell you that it is safe for you in particular. Those are separate questions, and this page keeps them separate. Second, GV28 is easy to confuse with CV7, which is also written "Yinjiao" in pinyin but uses different Chinese characters and sits on the lower abdomen. They are entirely different points.

The honest verdict on evidence: there is essentially no human research on GV28 for anything. Acupressure research as a whole is mostly small, short and unblinded, and GV28 sits well below even that low bar. It is a minor point in day-to-day practice, named in textbooks more as the endpoint of the channel than as a workhorse.

Everything described here is self-applied finger pressure against the gum tissue with a clean fingertip. Traditionally this point was also treated with needles or pricked to bleed by practitioners. Those are clinic procedures performed by trained people, and nothing like them belongs at home. If you are curious about the point, gentle pressure is the only version of it that is appropriate to try on yourself.

Where is GV28 and how do you find it?

GV28 sits inside your upper lip, at the spot where the thin web of tissue under the lip (the frenulum) joins the gum above your two front teeth.

• Start at your front teeth. Run your tongue along the front of your upper teeth until you find the two large central incisors. GV28 sits above them, not on them.
• Lift the upper lip. Use a mirror and gently roll your upper lip outward and up with a clean finger or thumb. You will see a thin vertical band of tissue running from the inside of the lip down to the gum. That band is the labial frenulum.
• Follow the frenulum down. Trace it to its lower end, where it blends into the gum. That junction, right on the midline, is GV28.
• Check the midline. The point sits exactly in the middle, lined up with the small gap between your two front teeth. If you have drifted left or right, you are off the point.

Most point maps place GV28 at the frenulum-gum junction. A few older sources describe it slightly higher, within the frenulum itself. The agreed landmark is the midline of the upper gum at the frenulum, so stay on that midline and you are within the area every source accepts.

The tissue there is thin and the bone beneath is close. You will feel firm bone almost immediately through a soft layer of gum. That is normal, and it is also the reason this point needs a light touch rather than a strong one. No needle instruction, depth or angle applies here — this page is finger pressure only.

How do you apply pressure to GV28?

1. Wash your hands first. This point is inside your mouth, so clean hands are not optional. Wash with soap and water and dry properly before you start.
2. Check your nails. Short, smooth nails only. Gum tissue tears easily, and a nail edge can break the skin without you noticing much.
3. Roll the lip up. With your other hand or a clean finger, lift the upper lip gently away from the gum so you can reach the midline comfortably.
4. Use the pad of one finger. Place the flat pad of an index finger or thumb on the frenulum-gum junction. Press straight back toward the bone, not sideways along the gum.
5. Keep it light. Use far less force than you would on a shoulder or a hand. Enough to feel firm contact and mild dull pressure, never sharp pain.
6. Hold briefly. Twenty to thirty seconds is plenty. You can add a very small circular movement if static pressure feels odd.
7. Repeat sparingly. Two or three short holds in a session, and no more than a couple of sessions a day. This is thin tissue and it does not tolerate repeated rubbing.
8. Rinse afterwards. A rinse with plain water is a sensible finish, especially if you have eaten recently.

Stop straight away if you taste blood, see bleeding at the gum line, feel a sharp or electric sensation, or notice the gum is sore afterwards. Soreness that lasts into the next day means the pressure was too hard or too long, and the point should be left alone.

Do not attempt anything beyond finger pressure. The classical treatments for this point involve needles or deliberate bleeding, and those are clinic procedures carried out by trained practitioners, not something to copy at home.

What is GV28 traditionally used for?

• Gum swelling and gum pain. The most consistent classical use, which follows directly from where the point sits. There are no human trials testing finger pressure on GV28 for gum problems. Sore, swollen or bleeding gums usually have a dental cause that needs a dentist, not pressure.
• Nasal congestion and nasal polyps. Older texts list GV28 among points for the nose, on the reasoning that the Governing Vessel runs up the midline of the face. No human research supports this for GV28, and nasal polyps are a structural problem that pressure cannot change.
• Nosebleed. Several classical sources mention it for epistaxis (nosebleed). This has not been tested. Standard first aid — leaning forward and pinching the soft part of the nose for ten minutes — is what actually helps, and a nosebleed that will not stop needs medical care.
• Mouth ulcers and bad breath. Traditionally grouped under "heat in the mouth". There is no evidence for this, and pressing directly on an ulcer will simply hurt it.
• Facial and dental pain. Listed in some point compilations for toothache of the upper front teeth. Toothache signals something happening inside the tooth, and no amount of pressure addresses that.
• Jaundice and agitation. Both appear in classical indication lists for GV28. These reflect an older theoretical framework rather than observed effects, and jaundice (yellowing of the skin or eyes) is always a reason to see a doctor promptly.

Taken together, the traditional picture is a local point for the mouth, gums and nose. What tradition has never supplied is a test of whether pressing it changes any of these things. For GV28 specifically, nobody has run that test.

Are there tips for using GV28 effectively?

• Use a mirror the first few times. The frenulum is easy to see and hard to feel accurately. Looking once teaches your finger where to go afterwards.
• Press toward bone, not along gum. A straight inward press is far gentler on the tissue than a sliding or scrubbing motion, which is what causes soreness.
• Keep sessions short. Oral tissue is thin and recovers slowly from repeated irritation. Short, occasional holds are better tolerated than long daily routines.
• Time it away from meals. A mouth that has just been rinsed is cleaner to work in, and you will not be pushing food debris into the gum line.
• Be realistic about scope. GV28 is a minor local point, not a general-purpose one. If you want a point for nausea, PC6 on the wrist has real controlled human trials behind it, which GV28 does not.
• Track what you notice. If you do try it, write down what you felt and for how long. Most short-term change is the ordinary come-and-go of symptoms, and a simple note helps you see that honestly.
• Let a dentist look first. If gum or tooth discomfort is what brought you here, a dental check comes before any self-pressure. Pressure on an infected gum can make matters worse.
• Tell your practitioner if you are already in treatment. Anyone treating you for a dental, sinus or jaw problem should know what you are doing in your own mouth.

One broader tip: nothing you read about GV28 online, including this page, substitutes for having a symptom properly looked at. Mouth and nose symptoms are among the easiest to assess in person and among the riskiest to guess about at home.

What do people get wrong with GV28?

• Confusing it with CV7. CV7 is also spelled Yinjiao in pinyin but sits on the lower abdomen and uses different Chinese characters. Videos regularly mix the two up. GV28 is the one inside the upper lip.
• Expecting a cure. No acupressure point cures gum disease, sinus problems or toothache, and GV28 has no human evidence behind it at all. Treating it as a fix delays the dental or medical care that actually resolves these problems.
• Using a fingernail. Gum tissue breaks easily. A nail edge can cut it, and a cut inside the mouth is an open door for bacteria.
• Pressing far too hard. People transfer the force they would use on a calf muscle to a thin strip of gum over bone. The result is a bruised, sore gum and nothing else.
• Dirty hands. Putting an unwashed finger in your mouth is a real infection risk, and it is the single most avoidable mistake on this list.
• Copying needle or bleeding techniques. Some older texts describe pricking this point to bleed. That is a practitioner procedure. Attempting any skin-breaking technique on yourself is dangerous and has no place in self-care.
• Working around braces or recent dental work. Pressing near brackets, wires, implants or a healing extraction site risks damage and pain. Leave the area alone until your dentist clears it.
• Using it instead of nosebleed first aid. A bleeding nose needs pinching and forward leaning, not a hand in the mouth. Swapping in a point press wastes the minutes that matter.

What does the research on GV28 actually say?

There is no useful human research on GV28. No controlled trial, and no reliable observational study that we can point to, has tested this point on its own for gum problems, nasal symptoms, nosebleed, toothache or anything else.

That absence is not unusual for a minor point. Acupuncture and acupressure research clusters around a short list of heavily studied points, and GV28 is not one of them. Within the Governing Vessel, the points that do appear in trials are GV20 and GV26, and findings there say nothing at all about GV28.

It also matters that acupressure research in general is weak. Most trials are small, run for a short time, and cannot blind participants, who obviously know whether a finger is pressing on them. That design makes placebo and expectation effects very hard to separate from any real effect. PC6 for nausea and vomiting is the clear exception, with repeated controlled human trials showing a genuine modest benefit. GV28 is nowhere near that position.

What "no evidence" means in practice is simple. It does not mean the point has been tested and failed. It means nobody has done the work, so any confident claim about what GV28 does is someone's opinion or a repeated classical line, not a finding. If a video or article tells you GV28 clears sinuses or stops gum disease, it is going beyond what anyone actually knows.

Treat GV28 as a point of historical and anatomical interest. If you choose to press it gently, do so understanding that there is no research predicting a result, and keep any actual mouth, gum or nose symptom in front of a dentist or doctor rather than relying on self-pressure.