Swollen gums: what is causing it, what helps today — and when it cannot wait

Most swollen gums are inflammation caused by bacterial plaque at the gum margin, and they settle within one to two weeks once the area is cleaned properly. The swelling that matters is the kind that is localised, growing and painful — a lump on the gum, often with throbbing pain or pus, which usually means an abscess and needs an appointment within a day or two. And there is one situation that is a genuine emergency: swelling that spreads into the face, closes the eye, pushes under the jaw, or comes with fever, difficulty swallowing or difficulty opening your mouth. That does not wait for the next working day. Everything else on this page sits between those two poles.

Before working out the cause, work out the urgency. These three questions sort almost every case.

If your cheek, lip, the area under your eye or under your jaw is swelling, the infection is no longer confined to the gum. Seek care the same day — through the dental out-of-hours service (zahnärztlicher Notdienst) outside opening hours, or a hospital emergency department if breathing or swallowing is affected.

Fever, chills, a general sense of being unwell, or swollen glands in the neck alongside a swollen gum mean the infection has systemic reach. Same-day care.

A single tender lump points towards an abscess, a fractured tooth, a dying nerve or something trapped under the gum — that is an appointment within a day or two. A generally puffy, red gum line along many teeth points towards plaque-related inflammation, which is a normal appointment and a change to your cleaning routine.

If none of the emergency signs apply, keep reading. If any of them do, stop reading and call someone.

The list is longer than most people expect, and the point of it is this: swollen gums are a symptom, not a diagnosis. The same appearance can arise from a popcorn husk and from a dying nerve, and only an examination separates them.

If you have no emergency signs and are waiting for an appointment, these measures are sensible and safe:

• Keep cleaning the area. Gently, with a soft brush, but do not skip it. Avoiding the swollen spot leaves the plaque that is feeding the inflammation exactly where it is. This is the single most counterintuitive and most important instruction on the page.
• Clean between the teeth. Interdental brushes or floss, once a day, sized to the gaps. Most gum swelling begins in a space a toothbrush never enters.
• Rinse with lukewarm salt water. Half a teaspoon in a glass of water, several times a day. It is soothing, mildly cleansing and cannot do harm.
• Cool from outside. A cold pack on the cheek, wrapped in a cloth, twenty minutes on and twenty off.
• Take a normal painkiller if you need one. Follow the packet, and check with a pharmacist if you take other medication.
• Sleep with your head slightly raised if the swelling throbs at night.

And three things people genuinely do that make it worse:

• Do not put an aspirin tablet against the gum. Acetylsalicylic acid burns the mucosa and produces a chemical ulcer on top of the original problem. Swallow painkillers; do not park them on the tissue.
• Do not apply heat. A warm compress or a hot water bottle encourages a spreading infection. Cold, not heat.
• Do not try to lance it yourself. A gum abscess that is opened with a needle at home usually reseals, and now with whatever was on the needle inside it.

Alcohol-based mouthwashes are also worth avoiding on an already sore gum. They sting, they dry the tissue, and they do not reach the place the trouble is coming from.

Seek care immediately — out-of-hours service or hospital, not tomorrow morning — if any of these apply:

• Swelling spreading into the cheek, under the eye, or under the jaw and into the neck.
• Difficulty swallowing, difficulty breathing, or a changed voice.
• You cannot open your mouth more than a couple of centimetres.
• Fever with a swollen face.
• Rapidly worsening swelling over a few hours.
• A swollen face in someone with a weakened immune system, poorly controlled diabetes, or on immunosuppressive medication.

These are uncommon, and the reason for listing them plainly is that dental infections in the face can occasionally spread along tissue planes into areas where they become genuinely dangerous. Recognised early, they are entirely manageable.

Germany operates a dental out-of-hours service (Notdienst) in every region, including at weekends and on public holidays, and our practice takes part in it. If you are unsure whether your situation qualifies, the safe rule is to be assessed and told it was nothing.

There is no mystery to it, and knowing the sequence takes most of the anxiety out of coming in.

We look, we probe, and where the cause is not visible we take an X-ray, because an abscess from a dying nerve and an abscess from a gum pocket look identical from the outside and need entirely different treatment. If pus is present, the priority is drainage — releasing the pressure usually brings dramatic and immediate relief. Then the cause is addressed: cleaning out the pocket, treating the nerve, removing whatever is trapped, or smoothing the edge that is rubbing.

Antibiotics are not the default. They are used when infection has spread beyond the local area, when you are systemically unwell, or when a specific medical condition makes them advisable. On their own, without drainage or cleaning, they generally postpone the problem rather than solve it.

If the underlying cause turns out to be periodontitis, you enter a defined pathway rather than a single visit: findings are recorded, a plan goes to your health insurance fund for approval, and treatment follows in stages with a structured aftercare programme over the following two years. That sequence is described in How periodontitis treatment works, step by step (EN).

Pregnancy. Hormonal changes make the gum react more strongly to the same amount of plaque, and swelling, tenderness and bleeding are common from the second trimester onwards. Occasionally a soft, harmless nodule appears at the gum margin, which usually recedes after the birth. Dental treatment is not off-limits during pregnancy — do tell us you are pregnant, and the second trimester is generally the most comfortable window for anything planned.

Braces and aligners. Fixed braces (feste Zahnspange) create dozens of new plaque traps overnight, and swollen gums during orthodontic treatment are extremely common. The answer is technique and tools, not less cleaning. With clear aligners (Aligner), a swollen area is more often mechanical: an edge or an attachment rubbing.

Medication. Certain drug groups — some anti-epileptics, some calcium channel blockers for blood pressure, and ciclosporin after transplants — can cause the gum tissue to overgrow. It is firm and typically painless, quite unlike an infection. Never stop a prescribed medication yourself; bring the list to the appointment so it can be discussed with your doctor.

Diabetes. Poorly controlled blood sugar amplifies gum inflammation and slows healing, and the relationship runs both ways — inflamed gums also make blood sugar harder to control. Swelling that keeps returning despite good cleaning is a reason to have both looked at.

Smoking. Smokers’ gums often look deceptively calm because nicotine constricts the small blood vessels. A smoker with visible swelling frequently has more going on underneath than the appearance suggests.

Children. Widespread very sore gums in a small child, with fever and small ulcers, is usually a viral infection rather than a hygiene problem. It is miserable for a few days, and fluids and pain relief matter more than brushing technique. Get it looked at.

A swollen face is the worst possible moment to be constructing German sentences. Two practical points.

Firstly, for the out-of-hours service, write down in advance what you would need to say: where it hurts, since when, whether you have a fever, what medication you take and any allergies. A note on your phone is enough.

Secondly, for anything beyond the acute episode, it is worth having a practice where the conversation simply happens in your language — particularly if the underlying cause turns out to be gum disease, which is treated over two years rather than one appointment. English is one of our working languages: see English-Speaking Dentist in NRW. Patients travel to us from across NRW, and for expats living in Düsseldorf, Cologne or Bonn, 20 to 30 minutes to reach an English-speaking practice is an entirely normal journey.