A swollen gum around one tooth usually has a local cause, something happening at that one spot rather than across your whole mouth. The most common are food or debris trapped under the gum edge, plaque that has built up at a hard-to-clean tooth, a back tooth that is only partway through the gum, a rough edge on a filling or crown, and infection in the gum pocket or at the root of the tooth. The first few often settle within days once the area is cleaned well. Infection does not, and it is the reason a swelling that lasts, throbs or comes with a bad taste should be seen by a dentist.
Why is my gum swollen around just one tooth?
When gums are inflamed everywhere, the usual story is plaque across the whole mouth, sometimes amplified by hormones, medications or smoking. Swelling at a single tooth points to something local. The gum around each tooth forms a small collar with a shallow groove, and anything that lingers in that groove, such as bacteria, a food fragment or a rough ledge, triggers inflammation right there.
Could food be stuck under the gum?
This is the most common cause of a sudden swelling at one tooth, and popcorn hulls are the classic culprit. Their thin, curved edge slips under the gum and stays there, and the body reacts to it as a foreign object. Seeds, fibrous meat, and shards of hard chips do the same. The area tends to feel tight and sore, and pressing on it may produce a dull ache.
Floss both sides of the tooth
Wrap the floss into a C-shape around the tooth and slide it gently below the gum edge, then lift. Repeat on the neighboring tooth. Tying a small knot in the floss sometimes helps catch a stubborn fragment.
Try a water flosser or a salt-water swish
A water flosser on a low setting, aimed along the gumline, can flush out debris. Warm salt water, about half a teaspoon in a cup, swished firmly for 30 seconds, also helps.
Brush the area gently
Use a soft brush angled toward the gumline. Scrubbing hard only irritates tissue that is already inflamed.
Give it a few days
Once the object is out, swelling usually starts easing within a day or two. If you cannot dislodge it, or the swelling worsens, a dentist can remove it quickly.
Toothpicks jabbed deep, pins, knives and fingernails can cut the gum and push debris further in. Also avoid placing aspirin or other tablets against the gum, which can burn the tissue.
Is it gingivitis in one spot?
Gingivitis does not have to be generalized. Plaque collects most where cleaning is hardest, so a tooth that is crowded, rotated, tucked behind a neighbor, or sitting at the very back of the mouth can have inflamed gum around it while the rest of your gums look fine. The same is true around a crown whose edge sits under the gum, or next to a spot where food packs between two teeth every time you eat.
Localized gingivitis looks puffy and redder than the surrounding gum and tends to bleed when brushed or flossed. It is usually not very painful. Gingivitis is typically reversible with consistent cleaning, because the inflammation is the gum's response to the bacteria sitting against it. Clean the spot thoroughly twice a day, including between the teeth, and for most people the bleeding and puffiness improve within about one to two weeks. Bleeding that continues past that point often means there is tartar under the gum that only a professional cleaning will remove, or that the cause is something other than simple gingivitis.
It is natural to brush more gently where gums bleed, but plaque left in place is what keeps them bleeding. Clean the area carefully and consistently. The bleeding usually decreases as the inflammation settles.
When is a swollen gum an infection?
Infection is the cause that matters most, because it does not settle with brushing and flossing alone. Bacteria can collect in a deep gum pocket or reach the tooth's nerve through decay or a crack, and in both cases the body walls off the infection, producing a swelling filled with pus. A few features make infection more likely than simple irritation.
- Throbbing or pain that buildsEspecially pain that keeps you awake or does not ease with over-the-counter pain relievers used as directed.
- Pus, a bad taste or a pimple-like bumpFluid draining from the gum or a salty, foul taste suggests an infection is draining.
- The tooth hurts to bite on or feels highPressure from swelling around the root can make the tooth feel like it hits first when you close.
- The tooth feels looseInfection and inflammation in the supporting tissues can make a tooth feel mobile.
- Swelling spreading beyond the gumPuffiness in the cheek, lip, under the jaw or in the neck means the infection is spreading.
If any of these apply, call a dentist and get seen soon, ideally within a day or so. Treatment usually means draining the infection and dealing with the source, which may be a deep cleaning of the pocket, root canal treatment or, in some cases, removal of the tooth. Antibiotics may be added when infection is spreading, but on their own they usually do not remove the source, so symptoms tend to return.
Go to urgent care or the emergency room right away if swelling spreads to your face, eye, jaw or neck, if you have a fever or feel generally unwell, or if you have trouble swallowing, breathing, or opening your mouth. These are signs a dental infection needs immediate hands-on treatment.
How long should a swollen gum take to go down?
Swelling from a lodged fragment or a small scrape usually starts to ease within a day or two of the cause being removed and has typically settled within a week. Localized gingivitis takes a little longer, often one to two weeks of good cleaning. Swelling that lasts longer than that, keeps coming back at the same tooth, or gets worse despite careful cleaning deserves a dental exam, and usually an X-ray, to find the underlying reason.
If you are not sure which category you are in, a quick photo and a description to a dentist can help. OneOral members can message a licensed dentist to talk through what they are seeing and how urgent it looks. For anything that sounds like infection, that conversation ends with the advice to be seen in person, which is the right answer.
Does salt water help a swollen gum?
Can a swollen gum around one tooth go away on its own?
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