A tooth abscess typically announces itself with a severe, constant, throbbing pain that doesn’t let up. Unlike a regular toothache that comes and goes, abscess pain tends to be persistent, often radiating into your jawbone, neck, or ear. If you’re also noticing swelling in your gums, sensitivity to hot and cold, or a foul taste in your mouth, there’s a good chance you’re dealing with an abscess.
What a Tooth Abscess Feels Like
The hallmark symptom is a throbbing toothache that feels deep and relentless. It’s not the sharp zing you get from biting into something cold. Abscess pain is heavy, constant, and often gets worse when you lie down because blood flow increases to your head. Chewing or biting on the affected tooth can send a jolt of pain through it, and hot or cold drinks may trigger intense sensitivity that lingers well after you’ve stopped eating or drinking.
The pain frequently spreads beyond the tooth itself. You might feel it in your ear on the same side, along your jawline, or up into your temple. Some people mistake it for an ear infection or sinus problem because the pain can be so diffuse. If you press on the tooth or the gum around it and get a sharp, localized spike of pain, that’s a strong indicator.
What to Look for in Your Mouth
Grab a mirror and a flashlight and take a close look at your gums around the painful tooth. An abscess often produces a visible bump on the gum that looks like a red, swollen pimple or boil. This bump can appear on the gum right next to the tooth or slightly above or below it. It may be yellow, red, or pinkish, and it sometimes feels soft or squishy to light pressure.
If that bump has already ruptured or is draining on its own, you’ll notice an open sore on your gum and a sudden foul or salty taste in your mouth. That taste comes from pus draining from the infection. You may also notice persistent bad breath that doesn’t improve with brushing. Some people actually feel temporary pain relief when an abscess starts draining, but this doesn’t mean the infection is gone. It just means the pressure has been released.
Swelling can also extend beyond your gums. Your cheek, jaw, or the area under your chin may look visibly puffy or feel tender to the touch. In some cases, the lymph nodes under your jaw or along your neck become swollen and sore.
Two Types of Tooth Abscess
A periapical abscess forms at the tip of the tooth’s root, deep inside. This type usually starts when decay or a crack in the tooth allows bacteria to reach the inner pulp, and the infection works its way down to the root tip. The pain tends to feel like it’s coming from inside the tooth itself, and the tooth is often extremely sensitive to temperature changes.
A periodontal abscess forms in the gum tissue at the side of a tooth root. This type is more common in people with gum disease and tends to produce a more obvious, visible swelling on the gum surface. The pain may feel more localized to the gum rather than the tooth. Both types need treatment, and both can cause serious complications if ignored.
Signs the Infection Is Spreading
A tooth abscess is a bacterial infection, and like any infection, it can move beyond the original site. Fever, chills, or a general feeling of being unwell (fatigue, body aches) are signs your body is fighting an infection that’s no longer contained to the tooth. Facial swelling that’s getting worse over hours rather than staying the same is another red flag.
The most dangerous complication is when the infection spreads into the floor of the mouth and the neck, a condition called Ludwig’s angina. This is a medical emergency. Symptoms come on quickly and include difficulty breathing, difficulty swallowing, drooling, a swollen or protruding tongue, neck swelling or discoloration, and slurred speech. Without treatment, this can block your airway entirely. If you experience any combination of trouble breathing, trouble swallowing, or rapidly worsening swelling in your neck or under your jaw, go to an emergency room immediately.
What Happens at the Dentist
A dentist can usually confirm an abscess with a few simple tests. They’ll tap on the suspected tooth to check for pain on percussion, which is a reliable indicator. They may also test the tooth’s response to heat, cold, or a small electrical pulse to determine whether the nerve inside is still alive or has died from infection. An X-ray will typically show the pocket of infection at the root tip or along the root.
Treatment focuses on physically removing the source of infection rather than just prescribing antibiotics. The American Dental Association’s current guidelines recommend that dentists prioritize hands-on treatment: draining the abscess, performing a root canal to clean out the infected pulp, or extracting the tooth if it can’t be saved. Antibiotics are reserved for cases where the infection has progressed to systemic involvement, meaning you’ve developed a fever or feel broadly unwell. An antibiotic alone won’t eliminate a tooth abscess because the drug can’t adequately penetrate the pocket of pus and dead tissue inside the tooth.
Abscess Pain vs. a Regular Toothache
Not every toothache is an abscess. A cavity can cause sensitivity to sweets or cold without any of the other signs. Inflamed tooth pulp (before it becomes fully infected) can produce sharp pain with temperature changes but typically still responds normally when the trigger is removed. The key differences with an abscess are the constant, throbbing baseline pain that persists even without a trigger, visible gum swelling or a draining sore, and any signs of systemic illness like fever or swollen lymph nodes.
If your pain is intermittent and mild, you likely have time to schedule a routine dental appointment. If your pain is constant and throbbing, you see swelling on your gums or face, or you have a fever, treat it as urgent. Dental abscesses do not resolve on their own. The infection will persist or worsen until the source is physically addressed.