A swollen jaw or gum is one of those symptoms that should never be brushed off. Most of the time it points to an infection that needs treating soon, occasionally it’s something more serious.
If you’ve got noticeable swelling, especially with pain, fever, or difficulty opening your mouth, please book an emergency dental appointment the same day. In our experience at Westcliff, swelling that’s been ignored for several days is usually the swelling that ends up needing antibiotics, drainage, and considerably more dental work than would have been necessary a week earlier.
What’s actually swelling, and why it matters
Dental swelling can come from several sources, and the location often hints at the cause. Swelling localised around a single tooth usually means an abscess or infection at the root tip. Swelling along the gum margin tends to mean gum disease or a stuck piece of food. Diffuse swelling of the jaw or cheek can mean a spreading infection, a salivary gland problem, or in rare cases something else entirely.
The body produces swelling by sending immune cells and fluid to fight infection. That’s normal. The problem is when the infection is contained in a small space (like inside a tooth or gum pocket) where it can’t drain naturally, the pressure builds and the swelling spreads outward.
Wikipedia has a clinical overview at en.wikipedia.org/wiki/Dental_emergency covering the broad categories of dental urgency.
When swelling is urgent
Some swellings can wait a day or two. Others can’t. Here’s how we’d assess the urgency.
Same-day emergency:
- Swelling spreading toward the eye, cheek, or under the chin
- Difficulty swallowing or breathing
- Fever above 38°C
- Trismus (can’t open your mouth properly)
- Pus discharge with significant pain
- Swelling that’s doubled in size in 24 hours
999 or A&E, not the dentist:
- Swelling closing your eye completely
- Swelling under the tongue raising your tongue toward the roof of your mouth
- Difficulty breathing or swallowing your own saliva
- Confusion, drowsiness, or signs of sepsis
Look, that last list isn’t us being dramatic. Ludwig’s angina and cavernous sinus thrombosis are both rare but real complications of untreated dental infections, and both can be life-threatening. If something feels seriously wrong, trust that instinct.
Common causes of swollen gums or jaw
The most frequent causes we see in clinic, roughly in order of frequency:
- Dental abscess — at the root of a tooth, usually from decay or a cracked tooth
- Periodontal abscess — in a gum pocket, linked to gum disease
- Pericoronitis — infection around a partially erupted wisdom tooth
- Trauma — biting cheek, hard food impaction, recent dental work
- Salivary gland blockage — stones or duct issues
- Allergic reactions — to food, medication, or dental materials
- Less common: cysts, tumours, viral infections
Pericoronitis is one we see a lot in younger adults. The gum flap covering an erupting wisdom tooth gets food trapped underneath and the area becomes infected. Classic symptoms are a swollen, painful gum at the back of the mouth, often with a bad taste. It tends to come and go, flaring up under stress or illness.
What we look for clinically
When you come in with swelling, the assessment usually involves several things. We’ll examine the affected area visually, palpate (gently feel) the swelling to assess its texture (soft and fluctuant suggests pus, hard suggests inflammation in bone), check whether you can open your mouth properly, and check for fever or swollen lymph nodes in the neck.
X-rays often help. They show abscesses at the root tip, bone loss from gum disease, impacted wisdom teeth, and occasionally cysts or other less common findings. We might also test the affected tooth for vitality (whether the nerve is alive or dead), which guides treatment.
What looks like one problem from the outside often turns out to be something slightly different on examination. That’s why a video consultation or phone advice can only go so far, you need to be physically seen.
Treatment options
Treatment depends entirely on the underlying cause.
| Cause | Typical treatment | NHS Band (England) |
|---|---|---|
| Dental abscess | Drainage, root canal, or extraction | Band 2 — £76.60 |
| Pericoronitis (mild) | Irrigation, antibiotics if severe | Band 1 — £27.90 |
| Pericoronitis (severe/recurrent) | Wisdom tooth extraction | Band 2 — £76.60 |
| Gum disease abscess | Deep clean, drainage | Band 2 — £76.60 |
| Crown after root canal | Lab-made crown | Band 3 — £332.10 |
| Trauma/food impaction | Cleaning, monitoring | Band 1 — £27.90 |
Antibiotics aren’t always given. Current NHS prescribing guidance reserves them for cases with significant swelling, fever, or evidence of spreading infection. The treatment of choice for an abscess is drainage and addressing the source, not just antibiotics.
What to do until you can be seen
While you’re waiting for an appointment, several measures help.
Helpful:
- Warm salt water rinses, several times a day
- Cold compresses on the outside of the cheek (15-20 minutes at a time)
- Painkillers — ibuprofen and paracetamol combined
- Sleep with your head elevated on extra pillows
- Soft, lukewarm foods only
- Stay well hydrated
Not helpful (and sometimes harmful):
- Heat packs on the swelling (encourages spread)
- Bursting any visible “gum boil” yourself
- Aspirin held against the gum
- Smoking, which significantly slows healing
- Alcohol, which interacts with painkillers and worsens dehydration
- Old antibiotics from previous prescriptions
Actually, on the antibiotics point, we get this fairly often. People save leftover amoxicillin and start a course at the first sign of swelling. It’s almost always counterproductive. Wrong dose, partial course, may not even target the right bacteria, and contributes to resistance. Please don’t.
When to ring us in Westcliff
If you’ve got facial swelling that’s worsening, persistent (more than 24-48 hours), painful, or accompanied by fever, please ring rather than wait. Same-day emergency assessment is genuinely the right call. We’d far rather see something turn out to be minor than have you arrive a week later needing more involved treatment.
For severe symptoms (difficulty breathing, swallowing, swelling closing the eye), go straight to A&E or call 999.
For everything else, our team at Westcliff Dental Practice can usually fit emergency appointments in the same day or the following morning. Give us a ring on 01702 344 500 and we’ll talk you through what to do next.
