A tooth abscess typically causes severe, constant, throbbing pain that can spread into your jawbone, neck, or ear. But pain is only one piece of the picture. Depending on the type of abscess and how long it’s been developing, you may notice swelling, sensitivity to temperature, a bad taste in your mouth, or even fever. Here’s what to look for and what each symptom tells you.
The Pain and How It Behaves
The hallmark symptom is a deep, throbbing toothache that doesn’t let up. In a study of patients with acute dental infections published in BMC Oral Health, about half reported constant pain rather than pain that came and went. The other half experienced sporadic episodes, but even those were intense enough to seek emergency care.
What makes abscess pain distinctive is how it disrupts sleep. Roughly 80 to 85% of patients in that same study said the pain interfered with their ability to sleep, largely because lying down increases blood flow to the head and intensifies the throbbing. If a toothache keeps waking you up at night, that’s a strong signal something more than a cavity is going on.
The pain often radiates. About a quarter to a third of patients reported pain spreading beyond the tooth itself, commonly into the jaw, ear, or temple on the same side. This can make it hard to pinpoint which tooth is the problem, and some people initially mistake the pain for an ear infection or sinus issue.
Sensitivity to Heat, Cold, and Pressure
An abscessed tooth is often hypersensitive to temperature. Drinking something hot or cold can trigger a sharp, lingering sting that lasts well after the drink is gone. This is different from the brief flash of sensitivity you might feel with a small cavity. With an abscess, the discomfort tends to be more intense and slower to fade.
Pressure sensitivity is equally telling. Biting down or chewing on the affected side can produce a jolt of pain. Some people describe the tooth as feeling “taller” than the others, as if it’s been pushed slightly upward in its socket. That sensation of elevation happens when infection and inflammation build up around the root, physically shifting the tooth’s position by a tiny amount.
Swelling and Visible Changes in the Gums
Swelling is one of the most recognizable signs. It can show up in several places depending on where the infection is concentrated. You might notice a puffy area on the gum near the affected tooth, sometimes called a gum boil. This is a small, rounded bump that forms when pus from the infection works its way to the surface. It may be red, tender to touch, and sometimes has a whitish or yellowish center.
In more advanced cases, swelling spreads beyond the gums into the cheek, jaw, or even the neck on the affected side. The skin over the swollen area can feel warm and firm. If the abscess is rooted deep in the gum tissue, you might not see any visible bump at all, but the area will feel tender when you press on it.
The affected tooth may also feel loose. When infection erodes the structures that hold a tooth in place, mobility increases. This is especially common with periodontal abscesses, which originate in the gum tissue rather than inside the tooth itself.
Bad Taste, Bad Smell, and Pus Drainage
A foul taste in your mouth, often described as salty or metallic, is a classic abscess symptom. It happens when the pocket of infection drains pus into your mouth, either through the gum boil or through the space between the tooth and gum. You might also notice a persistent bad odor that doesn’t go away with brushing.
Sometimes an abscess ruptures on its own, releasing a sudden gush of terrible-tasting fluid. The pain often drops dramatically right after, because the pressure that was building inside has been released. This relief is temporary. The underlying infection is still there, and without treatment it will rebuild or spread.
Two Types, Two Patterns
Not all tooth abscesses feel the same, because they start in different places.
A periapical abscess forms at the tip of the tooth’s root, usually as a result of deep decay, a crack, or an old filling that allowed bacteria to reach the inner pulp. The tooth itself is often the main source of pain. It may not respond normally to hot or cold because the nerve inside has been damaged or killed by the infection. The pain tends to be sharp in the early stages, with over half of patients in the acute phase describing it that way.
A periodontal abscess starts in the gum tissue beside the tooth, typically in someone who already has gum disease. The most common complaint is localized swelling, and pain isn’t always the leading symptom. You’re more likely to notice the tooth feeling loose, pus oozing when you press the gum, and a bad taste. The tooth itself usually still responds to hot and cold normally, because the infection is in the gum rather than inside the tooth.
Fever and Other Whole-Body Symptoms
When the infection begins to affect your body beyond the mouth, you may develop a fever, sometimes with chills. Lymph nodes under your jaw or along your neck can become swollen and tender. You might feel generally unwell, fatigued, or run down in ways that seem unrelated to a toothache.
These systemic symptoms mean the infection is no longer contained locally. Your immune system is fighting harder, and the bacteria may be entering surrounding tissues or the bloodstream.
Silent Abscesses With Minimal Pain
Some abscesses develop slowly over weeks or months and produce surprisingly little pain. A chronic abscess can quietly drain through a small channel in the gum, keeping pressure from building to the point of severe pain. You might notice a persistent pimple-like bump on your gum that occasionally leaks fluid, a low-grade bad taste, or mild tenderness that you’ve gotten used to ignoring.
The danger with a chronic abscess is that the infection continues to destroy bone and tissue around the tooth even when symptoms are mild. These are often caught on dental X-rays during routine visits, which is one reason regular checkups matter even when nothing feels obviously wrong.
Warning Signs of a Spreading Infection
Most tooth abscesses stay localized, but in rare cases the infection can spread into the soft tissues of the floor of the mouth, the neck, or deeper spaces in the head. This is a medical emergency.
The red flags to watch for:
- Difficulty breathing or swallowing. Swelling in the throat or under the tongue can start to close off your airway.
- Rapidly worsening swelling in the neck, under the jaw, or on both sides of the face.
- A swollen or protruding tongue that feels stiff or hard to move.
- High fever with chills that doesn’t respond to over-the-counter medication.
- Slurred speech or drooling caused by swelling that restricts normal mouth movement.
These symptoms can indicate a fast-moving infection called Ludwig’s angina, a cellulitis that spreads through the floor of the mouth and can compromise breathing within hours. If you experience any combination of these signs, treat it as an emergency.
Symptoms in Children
Children get tooth abscesses too, and younger kids may not be able to describe what they’re feeling. Watch for refusal to eat or drink (especially anything hot or cold), crying or irritability that worsens at bedtime, drooling more than usual, facial swelling on one side, or a visible bump on the gums. A child with a fever and any of these oral signs needs prompt evaluation, since infections in baby teeth can damage the developing permanent teeth underneath.