Tooth Abscess and Antibiotics: How Long, and What Fixes It

If you are reading this with a box of antibiotics on the side and a cheek that feels twice its usual size, here is the good news first: the thing that actually ends a tooth abscess is quicker and kinder than most people expect, and it happens at the tooth, often the same day. Antibiotics do have a part in the story, a smaller one than people think, and once you see why, the whole thing gets a lot less worrying.

How long does a tooth abscess last with antibiotics?

The honest answer surprises people: there is no date to give you, because antibiotics on their own are rarely what ends it. nhs.uk is plain that an abscess “needs urgent treatment by a dentist” and “will not go away on its own”. The medicine can calm things down. The abscess itself is finished at the tooth.

What nhs.uk does put a time on is the antibiotic. It names amoxicillin as a treatment for dental abscesses, and its guide to amoxicillin says: “For most infections, you should feel better within a few days.” It asks you to keep going after that: “You should carry on taking amoxicillin until you’ve finished the course, even if you feel better.” Whatever strength is printed on the box, nhs.uk’s advice is to take antibiotics “as directed on the packet or the patient information leaflet that comes with the medicine”, and the tooth still needs treating.

Once the tooth itself has been treated, the one time nhs.uk mentions is short and kind: “You may be offered painkillers to take for a few days after treatment and may also be given antibiotics.” A few days of painkillers. That is the clock most people are really hoping to hear about, and it starts the day the tooth is treated.

Why don’t antibiotics on their own clear a tooth abscess?

This is the fascinating bit. An abscess is a build-up of pus, and with a tooth, the infection behind it very often starts inside the tooth itself, in the soft middle where the nerve lives. Decay or a crack lets bacteria in, the nerve gives up, and the infection gathers at the tip of the root.

Think about how antibiotics get anywhere. They travel in your blood, like delivery vans that can only go where there are roads. The swollen gum and cheek are full of roads, so the medicine arrives, the swelling goes down, and you feel better. The inside of the tooth is the one place the roads barely reach: it is a little room inside a hard shell, and once the nerve in there has died, hardly any blood gets in, so hardly any medicine does either.

So the swelling settles, and the source sits quietly where it was. It is like snipping the heads off dandelions: the lawn looks lovely for a while, and then up they come again, because nobody touched the root. That is what our emergency page means by “A dental abscess is treated at the tooth, by a dentist; antibiotics alone rarely settle it for long.” The word doing the work there is “long”.

So what does fix a tooth abscess?

A dentist, at the tooth, in one of three ways. nhs.uk sets them out: “The dentist will drain away the pus. If a problem with your tooth has caused the abscess, you may need root canal treatment or the tooth may be removed. You’ll be given a local anaesthetic so you do not feel any pain.”

Draining is the part that brings the relief, because the pain of an abscess is mostly pressure: pus with nowhere to go, pushing on everything around it. Let it out and the pressure goes, a bit like the moment a tight blister on your heel pops.

Then the source is dealt with. A root canal cleans out that little room the antibiotics could not reach and seals it, so the source has gone and your own tooth stays. That is why it comes first wherever the tooth can be saved. When a tooth cannot be saved, taking it out removes the source in one go, and you are told why before anything is done.

Here is the part people don’t expect: the first visit is all about getting you out of pain. In practice hours we set out to see anyone with a dental emergency the same day, and you do not need to be a patient already. The tooth is numbed, the abscess drained or the nerve dressed, and only then is there a conversation about what comes next. The permanent repair is usually a second visit, planned and priced once the pain has gone, and in the emergency page’s words it is booked “usually within the fortnight”. How the same-day emergency appointment runs is set out step by step on our emergency page.

When are antibiotics the right treatment?

Less often than people expect. Our emergency page puts it like this: “Toothache and most abscesses are treated at the tooth, by draining or dressing it; antibiotics on their own rarely settle the problem for long. Where they are needed, for a spreading infection, they are prescribed on the day.”

A spreading infection is one that has moved out beyond the tooth into the tissue around it, and that is road country, so the medicine can get there and do its job beautifully, working alongside the treatment at the tooth.

There is a good reason to keep antibiotics for when they are needed, and it is about you. nhs.uk puts it simply: “taking antibiotics when you do not need them can mean they will not work for you in the future.” So if you walk in hoping for a prescription and walk out with the tooth treated and no tablets, that is the treatment working the way it should. And if you already have antibiotics, keep taking them as directed and get the tooth seen anyway; the tablets and the treatment are on the same side.

How can you tell a tooth abscess is getting better?

You will usually feel it before anyone tells you. The throb that kept you up eases off. The swelling goes down, the nasty taste fades, and the tooth stops feeling tall and sore every time your teeth meet. Then one evening you notice you have just eaten dinner on that side without thinking about it.

What those signs mean depends on what has been done. After the tooth has been drained, they mean the pressure has gone; after it has been root treated or taken out, they mean the source has been dealt with too. On antibiotics alone, the very same signs mean the swelling has calmed, which is lovely, and the dandelion root is still there, so a tooth that has stopped hurting that way still wants seeing.

What does it cost to treat a tooth abscess?

Here is the whole price picture, so nothing comes as a surprise on the day:

The emergency fee is for the visit: the examination and getting you out of pain. Whatever the tooth then needs is priced from the fee guide and told to you before it is done.

The two root canal figures differ because a molar has three or four canals and a front tooth one, and every one of them is cleaned and sealed. On a back tooth a crown usually follows: a metal crown from £332.10, a white crown from £450, and a porcelain or ceramic crown from £800. The extractions and the crowns are starting figures, and the figure for your own tooth is written down at the examination before anything is done. Payment is on the day, with 0% finance through Tabeo for the larger repairs, and our guide to what an emergency dentist costs in Solihull lays out the visit and everything after it.

The NHS is the other door, and for some people it is the better one. NHS urgent care is £27.90, and nhs.uk lists “draining a dental abscess and treating any infection” among what an urgent appointment can include. Root canal treatment and extractions then sit in Band 2, £76.60, one charge for the whole course however many items it takes, where our prices are per item. If you are entitled to free NHS treatment, that door costs you nothing, and our guide to how NHS urgent dental care works explains who qualifies.

Can A&E drain a tooth abscess?

It is a fair thing to wonder at two in the morning, and the answer is gentler than you might fear: a tooth abscess is a dentist’s job. nhs.uk says so in as many words: “Dental abscesses are usually treated by a dentist.”

A&E is for the rare case, and for an abscess the line on our emergency page is a swelling of the face that is closing an eye, or making it hard to breathe or swallow: that is A&E or 999. Everything else belongs with a dentist, and our guide to what hospitals do for toothache, and where to go instead explains the difference.

While you wait, nhs.uk’s advice is to “take painkillers, such as ibuprofen or paracetamol”, and never more than the packet says: “do not take more than the recommended dose of any painkiller”. A pharmacist can advise you, and if the throb is at its worst in the small hours, our guide to getting through toothache at night has what helps until morning.

So there is the whole picture. Antibiotics calm the swelling, and for most infections nhs.uk says you should feel better within a few days; the abscess itself ends at the tooth. If you are in Solihull, being seen today is simpler than you might think: ring 0121 709 3821 as early in the day as you can, because the earlier you ring, the sooner the slot.