Stitches after wisdom teeth: what they do and when they go

Most people reading this have just felt something with the tongue — a thread, a knot, a loose end — and want to know whether it matters. Usually it does not. A few things in the days after wisdom tooth surgery do matter and none of them are stitch problems, so they go first. Written post-operative instructions you were given govern over anything here.

Pain is a poor guide to urgency. Severe pain often accompanies something entirely local, and a spreading infection sometimes hurts less as it spreads, because the pressure that caused it has escaped into surrounding tissue. Swelling describes where an infection has reached, and that is what changes management. A stitch, by comparison, rarely causes more than irritation.

Some people are moved up that list by medical history rather than symptoms. An infection at a surgical site in somebody immunosuppressed, having chemotherapy, on long-term steroids, or whose diabetes is poorly controlled is assessed sooner. So is a socket that is not healing in somebody taking a bone-modifying medication or who has had radiotherapy to the jaws. Say so on the first call rather than the second.

If you cannot reach the office and the problem is one of the same-day items above, do not sit waiting for a callback. An urgent care centre or an emergency department can assess swelling, fever and bleeding, and the airway signs above need one regardless of who answers a telephone. Altered sensation is the one to keep chasing until you have spoken to somebody, because its value falls with time.

To reach a lower impacted third molar the gum has to be opened. An incision runs from behind the second molar backwards and outwards along the front edge of the jaw, usually with a short relieving cut forwards, and a full-thickness flap is lifted off the bone. The tooth comes out, the socket is irrigated, and the flap is laid back where it came from. The stitches hold it there while it reattaches.

That is the entire job. Almost every question patients have about stitches comes from assuming they do something else. They are not closing the hole the tooth came out of. They are not holding the clot in — that is held by the socket walls and by its own adherence to bone. They are not sealing the site against food or bacteria, and no material could.

How many there are varies with what was done. An erupted upper wisdom tooth often needs no incision and therefore no stitches: upper jaw bone is thinner and more elastic, and the tooth is frequently delivered by expanding the socket rather than by cutting. A deep lower impaction where a flap was raised and bone removed usually takes one to three, occasionally four. Two people operated on the same day can reasonably leave with four stitches and none.

Where the knot sits, and why

Knots are generally placed away from the incision line, usually towards the cheek side, so they are not resting on the wound they hold. A knot is foreign material, it gathers plaque, and one sitting over a healing edge slows that edge down. It is also why the stitch you feel with your tongue is often not over the socket but a centimetre away, which confuses people who go looking for it.

The other principle is tension. A flap dragged tight to make its edges meet will either tear at the knot or throttle its own blood supply, and both show up days later as an edge that has opened. So a flap is replaced without stretching it, and where tissue does not quite reach, it is left not quite reaching. A small gap at the back of the jaw is more often a design decision than a failure.

Suture material divides into two families. Resorbable material is broken down and absorbed by the body, and needs no removal appointment. Non-resorbable material is not, and comes out at a post-operative visit. Both are used around third molar sites and neither is right in every mouth. If non-resorbable material was used in your case, the removal date you were given is the one that applies, not a figure from an article.

Within the resorbable family what matters is how the material is destroyed. Gut sutures — chromic gut is the traditional oral surgery material — are collagen, digested by enzymes. Synthetic braided materials such as polyglycolic acid and polyglactin break down by hydrolysis, a reaction with water rather than an enzymatic attack. That is why the two behave differently in a mouth: enzyme activity varies a great deal between individuals and with how inflamed the tissue is, while hydrolysis runs at a steadier rate the tissue has little say in.

The table below is the general field rather than a menu. Any practice uses a small number of these routinely, and the working lives given are conventional expectations rather than promises about your mouth. Which one was used in your case has a specific answer, and the post-operative visit is the place to ask.

Braid against monofilament is the second axis, and a trade-off rather than a ranking. A braided strand is many filaments twisted together: soft, easy to tie, secure once knotted, and also a structure bacteria travel along and plaque sits in. A monofilament gathers much less, and is stiffer, springier, needs more throws in the knot, and leaves a cut end that can feel sharp against the tongue.

What decides it, case by case: how much tension the flap is under, whether the site was infected before surgery, how long the closure needs to hold, and whether returning for a removal visit is realistic. Somebody who will be several hundred miles away the week after surgery is a plain argument for resorbable material. A site that was actively infected is an argument against a braid. The decision is made at the chair with the flap in view, and can differ between one side of a mouth and the other.

For most dissolving materials the window is one to two weeks, with a spread either side wider than patients expect. Some are gone on day four. Some are still recognisable at three weeks. Neither is evidence on its own that anything has gone right or wrong.

The mouth is a hostile place for a suture, which is why an oral stitch does not behave like the same stitch in skin: warm, permanently wet, colonised by bacteria, awash in enzymes, and moving several thousand times a day with speech, swallowing and chewing. All of that accelerates breakdown. A chromic gut suture that would hold for a fortnight under a dressing on an arm may be gone in half that time behind a lower second molar.

Site matters within the same mouth. Lower sites tend to go faster: the tongue reaches them constantly, saliva pools in the floor of the mouth, and the flap moves with every swallow. Two stitches placed at one appointment with the same material can disappear a week apart.

The reason early loss is usually unimportant sits in the third row of that table. A suture is load-bearing for a few days only. In that time the cut gum edges knit to each other, and from then the stitch holds something that no longer needs holding. A stitch that survives to day ten has spent most of its life as a passenger.

There is therefore no benefit in trying to make a dissolving stitch last longer, and no reason to eat or clean differently to preserve one. The material is meant to give way once it is no longer needed.

For the first twenty-four hours the site is left completely alone. No rinsing of any kind, no spitting, no straws, no smoking or vaping, no probing with the tongue. Rinsing on day one risks losing a clot that has not yet organised, and it achieves nothing useful at that stage in any case.

From day two, warm salt water — roughly a teaspoon of salt in a cup of water — several times a day and after meals. Let it fall out of the mouth over the sink rather than spitting it: spitting generates exactly the negative pressure the rule about straws exists to avoid. A rinse in the first week floats debris away; it is not there to scrub.

Brush the rest of your teeth normally from the evening of surgery. Neglecting the whole mouth because one corner is sore raises the bacterial load everywhere, including at the site. Use a soft, small-headed brush and work towards the surgical area over the first few days; by day three or four the teeth beside the site can usually be brushed gently, and bristles touching a stitch do not usually harm it. What loosens a stitch is a tongue that will not leave it alone.

What actually pulls stitches out

• The tongue, by a wide margin. Worrying at a knot over several days loosens it, and almost everybody does this without noticing.
• Straws, spitting and vigorous swishing in the first two or three days.
• A high-pressure water flosser aimed near the site during the first week. It is a different instrument from a gentle irrigating syringe, and delivers a very different force.
• Chewing something tough directly on the site before the site can take it.
• Catching the thread on a fingernail, a toothpick or an interdental brush while trying to dislodge food.

An antiseptic mouthwash is used only if one was given to you for this surgery, on the schedule supplied with it. Alcohol-containing mouthwashes bought off a shelf sting exposed tissue and are not part of the first week. If nothing was prescribed, warm salt water is the routine and it is enough.

This is the commonest reason patients call about stitches, and the answer is usually that nothing needs doing. Usually is not always, and the way to tell them apart is to stop looking at the stitch and look at the site.

Three questions settle it. Is it bleeding, beyond a pink tinge in the saliva? Is the gum edge the stitch was holding now visibly gaping and mobile, so a flap of tissue lifts when you move your cheek? And has the pain changed direction — has something that was steadily improving started getting worse? If all three answers are no, a stitch lost on day five, seven or nine is usually a non-event: carry on with the salt water and mention it at your next visit.

A yes to any of them is a phone call. The situation that genuinely matters is uncommon: a flap that was under tension has opened, leaving bone meant to be covered exposed to the mouth. It announces itself over a day or two as a dull ache that is not settling, food working under the gum rather than into the socket, and a gap clearly larger than the socket. That is assessed in the chair.

What not to do

• Do not try to put it back, tie it to anything, or hold the edges together with anything.
• Do not pull on a stitch that is partly out. The buried portion may still be anchoring tissue, and pulling is how a partial loss becomes a complete one.
• Do not cut it yourself. A tail that catches on the tongue is trimmed at a visit, not at home with nail scissors.
• Do not swab, probe or clean the site to inspect it. A photograph in reasonable light with the phone torch on tells the office more than any prodding, and does no damage.

Swallowing one is not a problem. Suture material is inert, the quantity is trivial, and it passes. This is asked often enough to be worth answering plainly.

Why it came out

Usually because the gum around the knot swelled, then shrank back as the swelling resolved, leaving the knot nothing to grip. Sometimes because the knot itself slipped, which is likelier with the smoother materials. Sometimes because the tongue got there. Patients tend to assume they did something wrong — ate too early, rinsed too hard, laughed — and in most cases that is not correct.

Yes, in most lower third molar cases. This surprises people more than anything else about the recovery, because the model most patients arrive with is that surgery ends with a wound being closed.

Wounds heal in two ways. Primary intention is when the edges are brought together and the gap between them is negligible, as with a clean skin incision held by stitches. Secondary intention is when a defect is left open and fills in from the base and edges with granulation tissue, which contracts and is covered over by surface tissue. A socket is a hole the size and shape of a tooth root. Nothing pulls that closed, and third molar sockets heal by secondary intention as a matter of course.

So the stitches close the incision line, not the socket. Some closures deliberately leave a small gap at the back rather than sealing the flap edge to edge, so fluid has somewhere to drain instead of collecting underneath. Whether a site is closed tightly or loosely is decided against the particular flap, the particular patient, and what was found during the operation.

What the hole looks like, and when

In the first week the socket usually holds a dark red-brown clot that fills it. Through the second week that surface changes to a pale grey, yellowish or creamy white film. The film is granulation tissue and it is what healing looks like. It is not pus and it is not exposed bone. Pus has a distinct taste and smell and arrives with swelling. Exposed bone in a dry socket is hard and whitish, and the pain that comes with it is why anybody notices it.

The hole narrows from the edges inwards rather than filling from the bottom upwards. An upper socket is frequently closed over at the surface by two weeks. A lower socket after a deep impaction is often still a visible hole at three weeks and sometimes four, which is on schedule rather than delayed. Underneath, bone fills the space over three to six months.

A related question that arrives in the same breath: no, the socket does not need packing with anything. Material goes into a socket for particular reasons — helping control bleeding in a patient on an anticoagulant, or dressing a dry socket — not as routine. An empty-looking socket in an otherwise comfortable mouth is behaving.

Food getting into a lower socket is the defining nuisance of weeks two to four, and occasionally runs to six. It is not dangerous and does not usually cause infection, but it generates more calls than most genuine complications do. An open socket at the back of the lower jaw is a well-shaped trap sitting exactly where chewing happens.

The tool for it is a curved-tip irrigating syringe. If a lower socket is open and you were not given one, ask at your post-operative visit. Fill it with warm salt water. Place the tip at the opening of the socket rather than pushing it down inside. Press gently — the flow does the work, not the force. Repeat until what comes back is clear. After every meal and before bed, for two to four weeks, is the usual routine.

Timing matters as much as technique. Irrigation starts at about a week, once the clot has organised and once you have been told to start, not before. Flushing a socket on day three risks the one thing the first week was spent protecting. A household water flosser is not a substitute, however gentle its lowest setting looks on the dial.

What does not go into a socket

• Toothpicks, interdental brushes, cotton buds, tweezers, fingernails, anything rigid. Poking can strip out fragile new tissue and turn a healing socket into a painful one.
• A high-pressure water flosser, during the first weeks.
• Any preparation recommended by somebody who did not do the surgery and has not seen the site.

Diet does some of the work. Chew on the other side while the socket is open. Small hard particles are the problem — seeds, nuts, granola, popcorn, quinoa, rice at the early end of this period — because they lodge in the socket and are hard to flush out. Soft food does not pack the same way.

Two versions of food packing are worth separating from the ordinary one. A persistent foul taste and smell with pain that is increasing rather than settling is not simple food packing, and it is a call. And a socket still trapping food beyond about two months has come off the expected curve and should be looked at rather than assumed to be slow — sooner in anyone who smokes, takes a bone-modifying medication, or has had radiotherapy to the jaws.

Small sharp fragments working out of the gum during weeks two to six catch people out as well. These are bone spicules — slivers of socket wall the body is shedding rather than incorporating. They feel like a splinter, often surface a centimetre from the socket, and most come away on their own or with the tip of the tongue. One that is sharp or persistent is dealt with at a visit, under local anaesthetic if it needs it. It is not usually a piece of tooth, though having it looked at rather than assumed is reasonable.

Most stitch questions do not need an appointment. Knowing which ones do saves a wasted trip in one direction and a delayed problem in the other.

Worth a call

• A stitch lost within the first 48 hours, particularly after a lower impaction where a flap was raised.
• Bleeding that restarts as a stitch comes out and does not settle after thirty minutes of firm, unbroken pressure on folded gauze — sooner if you take an anticoagulant or antiplatelet medication.
• A gum edge visibly lifting or gaping, so tissue moves when you pull your cheek out, or a gap plainly larger than the socket.
• Pain that had been improving and is now getting worse, stitch or no stitch. That is the dry socket pattern, and it is treated rather than waited out.
• A loose end cutting or ulcerating the tongue or cheek. It is trimmed at a visit; there is no reason to put up with it.
• Suture material still clearly present at three weeks, or anything you were told would be taken out and has not been.
• Swelling increasing after day three, pus, a temperature at or above 100.4°F (38°C) with facial swelling, or mouth opening getting tighter. If the office cannot be reached, urgent care or an emergency department the same day.

Not worth a call on its own

• A stitch you can feel with the tongue, at any point.
• A stitch lost between day four and day ten with no change in bleeding, pain, or how the site looks.
• A stitch swallowed.
• A visible open socket at two to three weeks after a lower impaction.
• Food packing into a lower socket during weeks two to four, provided the pain is not increasing.
• A pale grey or creamy film over the socket in the second week.
• One side clearing its stitches a week before the other does.

When you do call, three things move it along faster than anything else: which teeth were removed and on what date, what the site looks like now, and whether the pain is going up or down. A photograph taken with the phone torch on is worth several minutes of description. If you are calling about altered sensation, say that first — it is the one item here whose usefulness depends on the day it is reported.