A dental abscess is one of the few situations in dentistry where waiting it out at home is genuinely dangerous. Yes, it’s an emergency, and the sooner you’re seen, the better the outcome.
If you’ve got a swelling on the gum, a bad taste in your mouth, or persistent throbbing pain that’s keeping you awake, you should book an emergency dental appointment straight away. In our experience, abscesses don’t resolve on their own, even if the pain temporarily eases.
What a dental abscess actually is
An abscess is a pocket of pus caused by bacterial infection, either in the tooth’s pulp (the nerve) or in the gum tissue around it. The body walls off the infection with a fibrous capsule, which is why you sometimes get a visible bump or “spot” on the gum that looks like it should burst.
There are two main types you’ll encounter:
- Periapical abscess — at the tip of the tooth root, usually from untreated decay or a cracked tooth letting bacteria into the pulp
- Periodontal abscess — in the gum pocket alongside the tooth, usually linked to gum disease
Both feel similar from the outside. Both can be serious. The NHS has a useful breakdown of dental abscess symptoms and causes if you want more clinical detail.
How to tell if it’s actually an abscess
Toothache and abscess pain often get confused. A simple cavity hurts when you eat or drink something cold or sweet, and the pain stops when the trigger goes away. An abscess is different. The pain is constant, throbbing, often worse when you lie down, and frequently keeps you awake at night.
Signs we look for clinically:
- Pain that throbs in time with your heartbeat
- A raised pimple or “gum boil” on the gum near the tooth
- Bad taste in the mouth, especially metallic or salty
- Swelling of the cheek, jaw, or under the eye
- Fever, feeling generally unwell, or swollen lymph nodes in the neck
- Pain that increases when you bite down or touch the tooth
You don’t need all of these to have an abscess. Even one or two of them, especially the constant throbbing pain or visible bump, warrants a phone call to the dentist.
Why it’s a real emergency
We don’t want to scare anyone, but dental abscesses can become genuinely dangerous if left untreated. The infection can spread along facial planes into the floor of the mouth (a condition called Ludwig’s angina), into the sinuses, or in rare cases into the bloodstream causing sepsis. Wikipedia has a clinical overview at en.wikipedia.org/wiki/Dental_abscess that’s reasonably accessible.
We had a patient last spring who’d had a “small bump” on his gum for three weeks and didn’t think much of it. By the time he came to us, the swelling had spread up under his eye and he was running a low fever. He needed a course of antibiotics, drainage, and eventually a root canal. If he’d come in at week one, it would have been a much simpler conversation.
Severe swelling under the jaw or tongue is a 999 situation if it’s affecting your breathing or swallowing. Don’t sit with that overnight.
What treatment looks like
Antibiotics alone won’t cure a dental abscess. That’s a misconception we hear a lot. Antibiotics can slow the infection down and reduce swelling, but they don’t address the source, which is the dead or dying tissue inside the tooth or the deep gum pocket. The source has to be physically dealt with.
Treatment options, depending on the type of abscess:
| Treatment | What it involves | NHS Band (England) |
|---|---|---|
| Drainage of swelling | Small incision to release pus | Band 2 — £76.60 |
| Root canal treatment | Remove infected pulp, clean and seal canals | Band 2 — £76.60 |
| Tooth extraction | Remove tooth if unrestorable | Band 2 — £76.60 |
| Crown after root canal | Often needed to protect the tooth | Band 3 — £332.10 |
| Periodontal cleaning | Deep clean for gum abscess | Band 2 — £76.60 |
Private fees are higher but typically include longer appointment times and faster scheduling. A private root canal on a back tooth can be £300 to £800 depending on complexity.
What to do until you can be seen
Getting professional treatment is the goal. While you’re waiting for that appointment, there are things you can do that help and things that genuinely make it worse.
Helpful:
- Rinse with warm salt water several times a day
- Take ibuprofen and paracetamol together if you can (alternating doses, following packet instructions)
- Keep your head elevated when sleeping, propped up on extra pillows
- Eat soft foods and avoid the affected side
- Stay hydrated
Not helpful, despite what the internet says:
- Applying heat (it can spread the infection)
- Bursting the gum boil yourself, even if it’s tempting
- Putting aspirin directly on the gum (causes chemical burns)
- Drinking alcohol to “kill the bacteria”
- Waiting to see if it gets better on its own
Actually, on the heat question, we get this one a lot. Cold compresses on the outside of the cheek can help with swelling. Heat applied to the area can encourage the infection to spread. People often get this backwards.
Antibiotics and when they’re needed
NHS guidance, and our own clinical practice, has shifted in the last decade away from automatic antibiotic prescribing. We don’t give antibiotics for every abscess anymore. They’re reserved for cases where there’s significant swelling, fever, or the infection has spread beyond the tooth.
If you do need them, they’re usually amoxicillin or metronidazole, sometimes both. The course is typically five to seven days. You’ll often feel improvement within 48 hours, but you must finish the full course even if you feel better. In our experience, people who stop early are the ones who relapse two weeks later.
Antibiotics from old prescriptions or borrowed from family members are a bad idea. The wrong antibiotic, wrong dose, or partial course contributes to resistance and may not even target the right bacteria.
Can you prevent abscesses
Most dental abscesses are preventable. They’re the end result of a problem that’s been brewing for months or years, untreated decay reaching the nerve, or gum disease creating deep pockets where bacteria thrive.
The mundane prevention advice is also the effective advice. Brushing twice daily with fluoride toothpaste, flossing or using interdental brushes, regular check-ups every six to twelve months, and addressing small problems while they’re still small. We’d add: if a tooth aches occasionally and then “settles down,” that’s not the tooth healing. That’s the nerve dying. Get it checked.
If you suspect you’ve got a dental abscess, please don’t sit on it. Our team at Westcliff Dental Practice can usually see you the same day or next morning for emergency assessment. Give us a call on 01702 344 500 and we’ll get you booked in.
