Trouble Swallowing or Breathing After Surgery

Call 911 and say that you cannot swallow and that you have had recent wisdom tooth surgery. Every other problem after a third molar extraction can wait for a phone call to the surgical office. Difficulty swallowing your own saliva, a change in your voice, or any sense that breathing takes effort cannot. Those three findings mean the space around the airway is being taken up by something, and the airway is the one structure in the head and neck that has no reserve.

An oral surgery office is a room with a chair, a monitor and a drug cart. A hospital emergency department is a room with an anaesthesiology team, an operating theatre, a computed tomography scanner and the equipment to secure a breathing tube through a mouth that will not open. When the airway is the question, the second room is the only room, and the fastest route into it is an ambulance crew who can start treatment on the way and radio ahead.

Two more points, because both cost time in real cases. Do not drive yourself. A person whose airway is narrowing can lose consciousness without warning, and the ambulance crew carries oxygen and an airway kit that your car does not. And do not lie down while you wait. Sitting upright, or leaning forward with your hands on your knees, keeps a swollen floor of mouth from falling back against the airway.

A lower wisdom tooth sits directly against the spaces that hold the airway open. Its roots often end below the attachment of the mylohyoid muscle, the sheet of muscle that forms the floor of the mouth. Pus that escapes the bone below that line does not stay in the mouth. It enters the submandibular space under the jaw, and from there the tissue planes of the neck are continuous — submandibular to sublingual, sublingual to submental, and downward alongside the great vessels toward the chest.

The clinically important detail is that these spaces are not sealed compartments. They are potential spaces separated by loose connective tissue, which means an infection expands along them rather than staying put. When the sublingual space fills, the floor of the mouth becomes firm and the tongue is pushed upward and backward. The tongue base is the part of the airway with the least room to give, so a swelling that looks modest from outside can be closing the airway from inside.

That is why external appearance is a poor guide here. A face that is puffy and soft after surgery is usually ordinary post-operative oedema. A neck that is firm, tender and warm under the jaw, with a floor of mouth that feels hard to the tongue, is something else. The second pattern can exist with a face that a patient describes as only a little swollen, which is exactly how these presentations get underestimated at home.

The organisms involved are usually the mixed flora already living around a partially erupted third molar — streptococci together with anaerobes such as Prevotella and Fusobacterium. They are not exotic. What makes them dangerous is location and the speed with which a mixed infection can spread through loose tissue once it has left the bone.

This can follow an extraction, and it can also occur without any surgery at all, from a wisdom tooth that was never removed. The presentation and the response are identical either way.

Ordinary post-operative swelling peaks around 48 to 72 hours after surgery and then recedes. It is soft, it sits over the cheek and jawline, it is worse in the morning after lying flat, and it improves with cold packs in the first day and with time thereafter. Airway swelling behaves in the opposite direction — it appears or worsens after day three, it is firm rather than soft, it involves the neck and the floor of the mouth rather than the cheek, and it does not improve overnight.

The distinction matters because the two are managed in completely different places. One is a review appointment. The other is an ambulance. The table below sets out the findings that separate them. It is written to be used at home, at two in the morning, by someone who is frightened and not thinking clearly.

One rule cuts through all of it. If you are asking whether your swallowing or breathing is bad enough to justify an emergency department, that question is itself the answer. Nobody who is breathing normally wonders whether they are breathing normally.

Airway compromise of this kind is not a slow process that gives days of warning. Published case series describe progression from first neck swelling to a threatened airway over a period measured in hours, not days, and the rate is not predictable from how the patient looks at any single moment. A person who is talking in full sentences at nine in the evening can be in difficulty by two in the morning.

There is also a technical reason that early arrival changes the outcome. Securing an airway is easier the earlier it is attempted. As the floor of the mouth becomes firm and the mouth opening reduces, the anatomy that a laryngoscope depends on stops being available. The team then moves to awake fibreoptic intubation through the nose, which requires specific equipment and an experienced operator, and if that is not possible the remaining option is a surgical airway through the front of the neck. Every hour of delay moves the patient along that sequence.

Antibiotics do not resolve this on their own once a collection has formed. An antibiotic reaches an abscess cavity poorly, and the cavity has to be opened and drained. A prescription started at home while waiting to see whether things settle overnight is not treatment of the airway problem; it is a delay with a plausible cover story. If a prescription was started before the airway symptoms began, keep taking it and tell the emergency team what it is and when the first dose was, but do not let it change the decision to go.

Steroids are sometimes given after third molar surgery to reduce ordinary swelling. They do not protect an airway against a spreading infection, and by damping fever and the appearance of inflammation they can make a serious presentation look less alarming than it is. If you have taken dexamethasone or a similar drug, say so on arrival.

The emergency department will assess the airway before anything else, usually within minutes of arrival and before any imaging. A doctor will listen to your voice, look at how far your mouth opens, feel the floor of the mouth and the neck, and measure oxygen saturation, pulse, blood pressure and temperature. If the airway is judged to be at risk, an anaesthesiology team is called at that point rather than after the scan.

A contrast-enhanced computed tomography scan of the neck is the usual next step, because it shows which tissue spaces are involved and whether there is a drainable collection or diffuse inflammation without one. Blood is taken for a white cell count, inflammatory markers, kidney function and blood cultures. Intravenous antibiotics are started empirically, before culture results, and are narrowed later when the laboratory identifies the organisms.

If a collection is present, it is drained under general anesthesia in an operating theatre, usually through incisions under the jaw and in the neck, with soft drains left in place for a few days. The causative tooth or the infected socket is dealt with in the same anaesthetic where that is possible. Many patients are kept intubated in an intensive care unit afterwards until the swelling has come down enough that the tube can safely be removed.

Admission is normal, and a stay of several days is normal. The team will want a clear history: when the tooth came out, who removed it, what medications and antibiotics you have taken and when, when the swelling started, when the swallowing changed, and any medical conditions. If you can, have someone bring the discharge instructions and prescription bottles from the surgery.

How you describe the problem determines how fast you are seen. The words that move a patient to the front of a triage queue are specific and physical, not general. Use them exactly.

1. Say "I am having trouble breathing" or "I cannot swallow my own saliva" — not "my face is swollen" and not "I have a toothache".
2. Say when the wisdom tooth was removed, and which side.
3. Say whether the swelling is under your chin or in your neck, and whether it crosses to both sides.
4. Say whether your voice has changed, and let the person hear it.
5. Say what antibiotic you are taking, at what dose, and when you started it.
6. Say whether you have taken a steroid such as dexamethasone.
7. Say whether you are diabetic, immunosuppressed, pregnant, or taking a blood thinner.
8. Say when you last ate or drank anything.

Things not to do

• Do not lie flat. Sit upright, or lean forward on your elbows if that helps you breathe.
• Do not drive yourself or let someone drive you if an ambulance can reach you sooner.
• Do not apply heat to a firm, spreading neck swelling. Heat encourages a collection to expand along the tissue planes.
• Do not squeeze, press or attempt to drain any swelling yourself.
• Do not take a leftover antibiotic from an old prescription and go back to bed.
• Do not eat or drink.
• Do not wait for morning because it is the middle of the night. Night is when these presentations deteriorate, and an emergency department is staffed for it.

If you are the person sitting with the patient rather than the patient, your job is to watch and to be willing to act. Stay in the room. If the voice becomes more muffled, if breathing becomes noisy, or if the patient stops being able to speak in full sentences, call 911 immediately, whatever anyone has said about waiting.

Anyone can develop a spreading infection from a lower third molar, and many patients who do have no risk factor at all. Several groups deteriorate faster or present later, which is worth knowing because it lowers the threshold for going in.

• Poorly controlled diabetes — impaired neutrophil function, faster spread, and a blunted fever response.
• Immunosuppression from disease, chemotherapy, long-term corticosteroids or transplant medication.
• A partially erupted lower wisdom tooth with a long history of recurrent pericoronitis before the extraction.
• An infection that was already established at the time of surgery rather than one that began afterwards.
• Heavy alcohol use, injection drug use, or a long gap since any dental care.
• Pregnancy, where the threshold for imaging and the choice of antibiotic both need a hospital decision rather than a telephone one.
• Anyone who lives alone, because the deterioration in these cases often happens overnight with nobody present to notice a change in the voice.

Age is not protective in either direction. Healthy adults in their twenties are well represented in published series of deep neck space infections from third molars, and being young and otherwise well is not a reason to wait until morning.

Once the airway is secure and the infection is controlled, the hospital team decides when drains come out, when intravenous antibiotics change to oral, and when discharge is appropriate. Expect a follow-up scan or a repeat examination before drains are removed, and expect the mouth opening to take several weeks to return, because the muscles of mastication have been inflamed and then splinted.

Tell the office that removed the tooth what happened, and ask for the operative note and any radiographs to be sent to the hospital team. A surgical office needs to know that one of its patients was admitted with a deep neck infection, whatever the cause, and the hospital needs the pre-operative imaging to understand what the anatomy looked like before any of this began.

One honest point about who should judge what happened. A spreading infection after a third molar extraction is a recognised complication that occurs after competent surgery, and in most cases the operation was performed correctly. But if you want an assessment of whether the original care contributed, the surgeon who did the operation is not the right person to make that judgement about their own work. Ask for the records, which you are entitled to, and have them reviewed by someone with no involvement in the case.