Signs of a Tooth Infection (and How It Differs From a Normal Toothache)
The most common signs of tooth infection are a constant, throbbing ache, pain when you bite, sensitivity that lingers after hot or cold, and swelling in the gum or face. A regular toothache, on the other hand, usually comes and goes and does not cause swelling or fever.
Quick answer
See a dentist soon if one tooth throbs on its own, hurts to chew on, or has a pimple-like bump on the gum next to it. Also watch for a bad taste, swollen glands under your jaw, or a fever. Those are the classic signs of an infected tooth or abscess according to Mayo Clinic.
A toothache without swelling, fever, or lingering pain is more often a cavity, a crack, or irritated gums. It still needs a checkup, but it is usually less urgent.
Go to the ER or call 911 if you have swelling with trouble breathing or swallowing, swelling that spreads toward your eye or neck, or a high fever with facial swelling. Those signs mean the infection may be spreading beyond the tooth.
Signs of Tooth Infection vs. a Normal Toothache
The two are easy to confuse, especially at 2 a.m. This table covers the differences a dentist looks for first:
| What you notice | Typical toothache | Likely tooth infection |
|---|---|---|
| Pain pattern | Comes and goes, often with sweets or cold | Constant, throbbing, may wake you up |
| Hot and cold | Sharp twinge that fades in seconds | Pain lingers for a minute or more |
| Biting | Usually fine, unless the tooth is cracked | Tender to bite; tooth may feel “high” |
| Swelling | None | Gum bump, puffy gum, or swollen cheek |
| Taste or smell | Normal | Bad taste, bad breath, or salty fluid |
| Whole-body signs | None | Fever, tiredness, swollen neck glands |
| Pain suddenly stops | Rare | Possible sign the nerve died, not that it healed |
Pain can also travel. For example, an infected lower molar can make your ear or temple hurt, which is why some people first notice a headache along with the toothache.
8 Signs of a Tooth Infection
An infection starts when bacteria reach the pulp, the soft tissue inside the tooth. That usually happens through a deep cavity, a crack, or an old filling that leaks. From there, the bacteria travel to the tip of the root and form a pocket of pus called an abscess. These are the signs that show up along the way:
- A throbbing, constant ache. Pressure builds inside the tooth, so the pain pulses and often gets worse when you lie down.
- Pain when you chew or tap the tooth. Inflammation at the root tip makes the tooth tender to pressure. Sometimes it even feels slightly taller than the teeth next to it.
- Sensitivity that lingers. A healthy tooth recovers from cold in a few seconds. An inflamed nerve keeps aching long after the drink is gone.
- A bump on the gum. A small pimple-like spot near the root, sometimes called a gum boil, is a drainage path for pus.
- Swelling in the gum, cheek, or jaw. Swelling means the infection has moved past the tooth itself.
- A bad taste or bad breath. A salty or foul taste often means the abscess is draining into your mouth.
- Swollen, tender glands. The lymph nodes under your jaw or in your neck react to the infection.
- Fever or feeling run-down. These signs suggest the infection is affecting your whole body, so call a dentist right away.
Not everyone shows every sign of tooth infection. In fact, a slow infection in a tooth that already had a root canal may cause almost no pain and only show up on an X-ray.
What Else Can Feel Like an Infected Tooth?
Several common problems cause tooth pain without an infection. Still, some of them can turn into one if they are left alone:
- A cavity: short, sharp pain with sweets or cold that stops quickly.
- A cracked tooth: a jolt of pain when you bite down or release your bite.
- Gum irritation: soreness around one spot, often from trapped food like a popcorn husk.
- Sinus pressure: several upper back teeth ache together, especially when you bend over.
- Grinding or clenching: dull morning ache in the jaw and teeth, sometimes with headaches.
Because these problems can copy the signs of a tooth infection, even dentists rely on tests rather than symptoms alone.
How a Dentist Confirms the Diagnosis
At our Lauderhill office, checking a painful tooth takes a few minutes. First, we ask where it hurts and what sets it off. Then we run a few simple tests:
- Cold test: a cold swab shows whether the nerve responds normally, lingers, or does not respond at all.
- Tap and bite tests: tenderness to pressure points to inflammation at the root tip.
- Gum check: we look for swelling, a drainage bump, or a deep gum pocket.
- X-ray: an infection at the root tip often shows up as a dark area in the bone.
Together, these tell us whether the nerve can recover, whether it is infected, and which tooth is the real source of the pain.
How a Tooth Infection Is Treated
Once the signs of tooth infection are confirmed, the goal is to remove the source of the bacteria, because the infection cannot heal while it is still inside the tooth. Depending on the damage, that means one of these options:
- Root canal treatment: the infected pulp is removed, the canals are cleaned and sealed, and the tooth is usually protected with a crown. The American Association of Endodontists notes that this saves the natural tooth in most cases.
- Draining the abscess: a small opening releases pus and relieves pressure, usually along with other treatment.
- Tooth extraction: if the tooth is too broken down to save, removing it clears the infection. Afterward, we can discuss replacing it.
- Antibiotics, when needed: they are added if the infection is spreading or causing fever. They do not replace treating the tooth.
That last point surprises many people. The ADA guideline on antibiotics for dental pain recommends against antibiotics for most infected teeth unless there are signs of spread, such as fever or malaise. The dental procedure is what actually fixes the problem.
Root canals are done right here at Luxe Dental. Dr. Jonathan Journo is an endodontist on our team, so most patients do not need a referral elsewhere.
What to Do Until You Can See a Dentist
- If you notice signs of a tooth infection, call first. Meanwhile, take an over-the-counter pain reliever as the label directs. The ADA recommends ibuprofen or naproxen, alone or combined with acetaminophen, as the first choice for dental pain, if they are safe for you.
- Rinse gently with warm salt water a few times a day.
- Hold a cold pack on your cheek for 15 minutes at a time if there is swelling.
- Chew on the other side and avoid very hot, cold, or sugary foods.
- Do not place aspirin on the gum, because it can burn the tissue.
- Do not pop a gum bump or take leftover antibiotics from a past illness.
Home care can take the edge off, but it cannot clear an abscess. If you are curious about herbal options, we explain what the research does and does not show in our guide to natural antibiotics for tooth infections.
Questions
Tooth Infection FAQs
Can a tooth infection go away on its own?
No. The pain can fade, but that usually means the nerve inside the tooth has died or the abscess has drained. The bacteria are still there, so the infection keeps spreading quietly until a dentist cleans it out.
How long can a tooth infection go untreated?
There is no safe waiting period. Some infections smolder for months, while others spread to the face or neck in a few days. So if you notice swelling or a fever, call a dentist the same day.
Will antibiotics cure a tooth infection?
Not by themselves. The American Dental Association advises treating the tooth first, with a root canal, drainage, or extraction. Antibiotics are added mainly when the infection spreads and causes fever or swelling beyond the tooth.
What does a tooth infection feel like?
Most people describe a deep, throbbing ache that pulses with their heartbeat. It often hurts to bite, the tooth can feel slightly taller than its neighbors, and the pain may spread to the ear, jaw, or temple.
Can a tooth infection make you sick?
Yes. A spreading infection can cause fever, tiredness, and swollen glands under the jaw. In rare cases it reaches the bloodstream, which is a medical emergency.
Is it a sinus infection or a tooth infection?
Sinus pressure often makes several upper back teeth ache at once, and the pain gets worse when you bend forward. By contrast, a tooth infection usually points to one tooth that hurts when you tap or bite on it. An exam and an X-ray settle the question.
Think You Have a Tooth Infection?
Our emergency dentist in Lauderhill can find the cause of your pain and treat it, often the same day you call.
Luxe Dental · 5280 N University Dr, Lauderhill, FL 33351
Sources
- Mayo Clinic. Tooth abscess: symptoms and causes. (link)
- Cleveland Clinic. Abscessed tooth. (link)
- American Dental Association. Antibiotics for dental pain and swelling guideline (2019). (link)
- American Dental Association. Oral analgesics for acute dental pain. (link)
- American Association of Endodontists. What is a root canal? (link)
Read next
- Strongest Natural Antibiotic for a Tooth InfectionA dentist explains which home remedies help with the pain and which ones cannot reach the infection.
- Can a Toothache Cause a Headache?Why an infected tooth can leave you with a headache, and how to tell the two apart.
- Why Do Toothaches Feel Worse at Night?The reason dental pain tends to spike once you lie down.