Why does gum pain happen, and how does it go away?

Gum pain comes from one of three mechanisms: the tissue is inflamed, pressure is building on a spot, or an infection is progressing. Telling the source apart is not about how severe the pain is but about three questions: is the pain in one spot or spread over a wider area, what makes it worse, and does it come with swelling or a high temperature. The answers to these three questions largely decide which of the five conditions below you are looking at.

The most common source is gum inflammation. When the layer of bacteria that builds up on the tooth surface is not cleaned away, the gum turns red, swells and becomes tender to the touch. This pain is usually felt not in a single tooth but along a strip spanning several teeth; it gets worse when you brush or bite into something hard and eases with rest. Once the build-up has hardened into tartar, a brush will not remove it, and the pain does not stop on its own.

The second source is a tooth trying to come through, or a partly erupted tooth, most often a lower wisdom tooth. Food debris and bacteria get under the flap of gum left over the tooth, and the area becomes inflamed. This condition is called pericoronitis, and it has its own tell-tale signs: the pain spreads from the back of the jaw towards the ear, swallowing becomes difficult and the mouth does not open fully.Food debris trapped under the flap, or an opposing tooth that keeps catching it while you chew, sets the problem off and keeps it going.

The third source is a denture. If the edge of a newly fitted or long-worn denture presses too hard on one spot, that spot becomes constantly irritated and, over time, turns into a painful sore. The signs of this pain are clear: it gets worse while the denture is in and eases once you take it out, and it comes back at the same spot every time. Filing the denture down yourself moves the pressure point but does not solve it; the right step is to have your dentist adjust the denture.

The fourth source is food trapped between your teeth. Where the gums have receded, there is a gap, or a filling has an overhanging edge, something like a fibre or a seed can get wedged in and that spot starts throbbing within hours. Once the trapped food is removed with floss, the pain eases quickly; if the same spot keeps trapping food again and again, the cause is most likely the tooth itself and needs checking.

The fifth and most serious source is a dental abscess: a pocket of infection formed where inflammation has collected at a root tip or deep in a gum pocket. This pain is not spread over a wide area; it is usually concentrated around a single tooth, throbs continuously, gets worse when you touch or bite on the tooth, and often comes with swelling in that area. Unlike the other four conditions, an abscess does not heal on its own; it does not clear until the infection inside it is drained.

There is a common habit that confuses all five conditions: pressing a painkiller such as aspirin directly against the sore gum instead of swallowing it. When aspirin touches the tissue, it can cause a chemical burn, seen as a white patch that peels at the surface, and this takes longer to heal than the original pain. Painkillers are made to be swallowed, not applied to tissue; follow the instructions in the patient information leaflet for the correct use.

The distinction below looks not at how severe the pain is but at the signs that come with it. Most of the conditions on the left settle within a few days on their own or with a simple fix; each one on the right needs seeing a dentist the same day or within a few days.

For gum pain, the place to go is the dentist nearest to you; this page does not replace that visit. The sequence below is so that you know which steps should not be skipped.

1. 1

   The history of the pain

   When it started, whether it is in one tooth or a wider area, what makes it worse, whether you wear a denture, and whether you smoke or have diabetes are the first things asked. This information alone narrows down the possibilities considerably.

2. 2

   Visual examination and a touch test

   Redness, swelling, a mark left by a denture or a gum flap are assessed visually; suspect teeth are tapped lightly to see whether the pain is reproduced at the same spot.

3. 3

   Pocket measurement

   Using a fine-tipped probe, the depth at the gum margin is measured. A deep pocket is a sign that the inflammation has moved from the gum into the bone and will not settle with brushing alone.

4. 4

   X-rays

   A pocket of infection at a root tip, the position of a partly erupted tooth or bone loss can only be seen on an X-ray. This step is not skipped if there is swelling or throbbing pain.

5. 5

   Denture check

   If you wear a denture, how it fits and where it presses are checked; if the pain is coming from here, this is corrected before looking for a problem in the teeth.

6. 6

   The outcome, and what happens next

   By the end of the examination, the source and how urgent it is become clear. If the source is an abscess or a spreading infection, treatment happens the same day; if it is gingivitis or denture pressure, a plan over a few days is discussed.

There is no single treatment shared by these five conditions; what is done depends entirely on the source.

The points below explain what putting it off actually changes for each of the five sources; the aim is so that you can ask the right question whichever dentist you see.

How long it takes depends on the source. The timeline below shows the realistic course of the four conditions we see most often.

1. The first 48 hours

   Within this time it becomes fairly clear which condition you are dealing with: pain from inflammation eases with better care, pain from a denture eases once it is taken out, and pain from an abscess keeps throbbing despite painkillers.

2. One week after improving your care

   Pain and tenderness from gum inflammation noticeably ease within this time. If it does not ease, there may be hardened tartar underneath that a brush cannot reach.

3. A few days after a denture adjustment

   Pain at the adjusted spot usually eases noticeably within a few days. If the same spot starts hurting again, a further adjustment is needed.

4. After an abscess has been drained

   The throbbing eases substantially within the first few days; tenderness can last a few more days. The pain is not expected to stop completely until the source tooth is treated, with root canal treatment or extraction.

Because each of the five sources needs a different procedure, giving a single range here would be misleading: for one patient a single cleaning session is enough, while another needs draining and root canal treatment. These are the items that determine the scope:

The source of the pain

Tartar removal, cleaning a gum flap, adjusting a denture, correcting a filling and draining an abscess are completely different procedures. A figure given before the source is identified by examination and X-rays is bound to change.

Whether imaging is needed

A surface-level inflammation may not need an X-ray; if there is suspicion at a root tip, a panoramic X-ray or a CBCT scan comes into play.

Whether extraction is needed

If a partly erupted tooth keeps becoming inflamed, or the tooth behind an abscess cannot be saved, extraction comes into the picture; this changes the scope of the procedure.

How many teeth and areas are affected

Pain confined to a single spot and a condition covering several areas of the mouth are not costed the same way.