Why Does My Tooth Hurt?
The honest verdict
This is usually not an allergy
Tooth pain is rarely caused by an allergy. The overwhelming majority of cases stem from dental problems — cavities (dental caries) that reach the inner pulp, pulpitis (inflammation of the tooth nerve), gum disease (gingivitis or periodontitis), a cracked or fractured tooth, or a dental abscess. Sinus infections can also cause referred pain to the upper teeth. True allergies can cause oral itching, tingling, or swelling (as in oral allergy syndrome), but they do not typically cause the sharp, persistent, or throbbing pain that characterizes toothache. If tooth pain occurs without oral itching or swelling, a dental cause is far more likely.
This is a general research summary, not a diagnosis. It can't tell you what's causing your symptom — a clinician can.
Check this first
When tooth pain is an emergency
Most of the time this can be handled calmly. But a few signs mean you shouldn't wait. Match what you're seeing to the right level of care below.
If any emergency sign below is present, call 911 or go to the ER now.
- Emergency
Tooth pain with swelling of the face, jaw, or neck that makes it hard to breathe or swallow — call 911 (possible deep neck infection or airway compromise).
Call 911 or go to the ER now
- Urgent
Severe, throbbing tooth pain with fever, facial swelling, or a visible bump on the gum — go to the ER or an emergency dentist (possible dental abscess requiring drainage).
Get seen today — urgent care or same-day visit
- Urgent
Tooth pain after a recent injury or accident to the face or mouth — seek dental or medical evaluation even if the tooth appears intact (possible hidden fracture or nerve damage).
Get seen today — urgent care or same-day visit
- See a doctor
Pain that is persistent, worsening, or accompanied by difficulty opening the mouth, a bad taste, or pus draining from the gum — see a dentist within 24-48 hours (possible abscess or advanced infection).
Book a routine visit with a clinician
- See a doctor
Tooth pain that lasts more than 1-2 days, or pain that wakes you from sleep — schedule a dental appointment (likely pulpitis or other dental pathology needing treatment).
Book a routine visit with a clinician
When in doubt, err toward getting seen. These tiers are a general guide, not a substitute for a clinician's judgment about your specific situation.
Key facts
Dental cavities (caries) are one of the most common health conditions worldwide, affecting about 2.5 billion people (nearly 1 in 3) according to the Global Burden of Disease study.
Oral allergy syndrome (pollen-food allergy syndrome) affects up to 50-75% of people with pollen allergies, but it causes itching and tingling of the mouth — not actual tooth pain.
Dental abscesses are a common cause of emergency room visits for dental pain, with an estimated 2 million ER visits per year in the United States for dental-related complaints.
What's causing it
The same symptom can come from very different places. Here are the usual suspects for Teeth, gums, and jaw — the oral cavity including enamel, dentin, pulp (nerve), periodontal ligaments, and surrounding bone, tagged by mechanism and how common each one is — so you can see where an allergy actually fits.
Dental cavity (caries) and pulpitis
A cavity that penetrates through the enamel and dentin to reach the inner pulp (nerve) causes inflammation called pulpitis. This produces sharp pain with hot, cold, or sweet stimuli, and can progress to a persistent, throbbing ache. Pulpitis requires dental treatment — a filling or root canal.
Dental abscess or infection
A bacterial infection at the root of a tooth or in the surrounding gum tissue creates a pocket of pus (abscess). Symptoms include severe, throbbing pain, swelling of the gum or face, fever, and a bad taste in the mouth. A dental abscess is a serious condition that requires prompt dental or medical care.
Gum disease (gingivitis or periodontitis)
Inflammation of the gums from plaque buildup causes redness, swelling, bleeding, and sometimes dull pain. Advanced gum disease (periodontitis) can damage the bone and ligaments supporting the teeth, leading to loosening and deeper pain. Good oral hygiene and professional dental cleanings are the mainstays of treatment.
Cracked or fractured tooth
A crack in the tooth from biting something hard, grinding (bruxism), or trauma can cause sharp pain when chewing or when the tooth is exposed to temperature changes. Some cracks are visible; others require dental X-rays to detect. Treatment depends on the depth and location of the crack.
Sinus infection (sinusitis) causing referred pain
The roots of the upper teeth are located very close to the maxillary sinuses. When the sinuses become inflamed or infected, the pressure can radiate to the upper teeth, causing a dull, aching pain that affects multiple teeth on one side. This pain often worsens when bending forward or with head movement.
Oral allergy syndrome (pollen-food allergy syndrome)
In people with pollen allergies (hay fever), eating certain raw fruits, vegetables, or nuts can cause itching, tingling, or mild swelling of the lips, mouth, and throat. This is oral allergy syndrome — a cross-reaction between pollen proteins and similar proteins in foods. It rarely causes actual tooth pain, though the tingling sensation may be mistaken for tooth discomfort. Symptoms typically resolve within minutes and are not dangerous.
Is this an allergy? Usually, no
It's a common assumption, so it's worth being clear about — and pointing you toward what's more likely going on.
Tooth pain is usually not an allergy. True allergies rarely cause tooth pain — the sensation of dental pain is almost always from a structural or infectious problem in the tooth or gum. Oral allergy syndrome (pollen-food allergy syndrome) can cause itching, tingling, or mild swelling of the lips, mouth, and throat after eating certain raw fruits, vegetables, or nuts, but this is a tingling or itching sensation, not the sharp or throbbing pain of a toothache. If you experience tingling or itching in the mouth after eating specific foods, an allergist can help diagnose oral allergy syndrome. However, if you have actual tooth pain — especially persistent, throbbing, or temperature-sensitive pain — a dental cause is far more likely and a dentist should be your first stop.
Because an allergy is unlikely to be the driver, the most useful next step is a clinician who can look at the actual cause — not an allergy test.
Relief you can try at home
If your symptom is mild and you have no red-flag signs, these gentle steps often help. They soothe — they don't replace figuring out the cause.
- 1
Rinse with warm salt water
Mix 1/2 teaspoon of salt in a glass of warm water and swish gently for 30 seconds before spitting. This can help reduce inflammation, clean the area, and soothe irritated gums. Repeat as needed, especially after meals.
- 2
Apply a cold compress
Place an ice pack wrapped in a thin cloth on the outside of the cheek over the painful area for 15-20 minutes at a time. This can reduce swelling and numb the pain. Avoid applying ice directly to the tooth or gum.
- 3
Take over-the-counter pain relievers
Ibuprofen (Advil, Motrin) or acetaminophen (Tylenol) can help manage tooth pain. Follow label directions and do not exceed the recommended dose. Avoid placing aspirin directly on the gum or tooth — it can cause a chemical burn.
- 4
Avoid triggers
Avoid very hot, cold, sweet, or hard foods that may worsen the pain. Chew on the opposite side of the mouth. If the pain is triggered by temperature, the tooth likely has a cavity or exposed dentin that needs dental evaluation.
Stop any step that makes things worse. If the symptom isn't easing within a few days, check in with a clinician.
When to see a doctor
See a dentist as soon as possible for any tooth pain that lasts more than 1-2 days, is severe, or interferes with eating or sleeping. Prompt dental care is needed for cavities, pulpitis, cracked teeth, and gum disease. Go to the ER or an emergency dentist immediately if you have tooth pain with facial swelling, fever, difficulty breathing or swallowing, or a visible bump on the gum — these can signal a dental abscess or spreading infection that requires urgent treatment. If you have oral allergy syndrome symptoms (itching, tingling of the mouth after eating raw fruits or vegetables), see an allergist for evaluation and management.
❓Frequently Asked Questions
Yes — sinusitis (inflammation or infection of the sinuses) can cause referred pain to the upper teeth. The roots of the upper molars and premolars sit very close to the maxillary sinuses. When the sinuses are congested or infected, the pressure can radiate to these teeth, causing a dull, aching pain that often affects multiple teeth on one side. The pain typically worsens when bending forward or with head movement. A dentist or doctor can help distinguish sinus-related tooth pain from a true dental problem.
It is very rare for a food allergy to cause actual tooth pain. Oral allergy syndrome (pollen-food allergy syndrome) can cause itching, tingling, or mild swelling of the lips, mouth, and throat after eating certain raw fruits or vegetables, but this is a tingling or itching sensation — not the sharp, throbbing, or persistent pain of a toothache. If you experience mouth tingling after eating, an allergist can evaluate you for oral allergy syndrome. True tooth pain is almost always dental in origin.
Go to the ER if tooth pain is accompanied by swelling of the face, jaw, or neck that makes it hard to breathe or swallow; if you have a fever with facial swelling; if there is a visible bump on the gum that is growing; or if you have difficulty opening your mouth. These can signal a dental abscess or a spreading infection that may become serious. For tooth pain without these signs, a dentist is the appropriate provider.
Mild tooth pain from temporary irritation (like a small cavity or gum irritation) may come and go, but tooth pain rarely resolves permanently without treatment. Pain that goes away after a few days may indicate that the nerve inside the tooth has died (pulp necrosis), which can lead to a silent infection or abscess. Any tooth pain that lasts more than 1-2 days should be evaluated by a dentist.
A cavity (dental caries) is a hole in the tooth caused by decay that starts in the enamel and can progress to the inner dentin and pulp. An abscess is a pocket of pus caused by a bacterial infection, usually at the root of a tooth or in the surrounding gum. A cavity may cause sensitivity to hot, cold, or sweet; an abscess typically causes severe, throbbing pain, swelling, fever, and sometimes a bad taste. An abscess is a more serious condition that requires urgent treatment.
Medically reviewed by
Dr. Chet TharpeMD
Last reviewed July 2026
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Read moreThe best next step is a real clinician
This symptom is usually not driven by an allergy, so an allergy test won't give you the answer. A primary care doctor or the right specialist can examine what's actually going on and guide you from there.
Curex focuses on at-home allergy testing and immunotherapy, which isn't the right fit for this symptom — and never a substitute for medical care.
- 1Mayo Clinic — Toothache: Causes and when to see a dentist
- 2Cleveland Clinic — Toothache: Causes, Treatment & Prevention
- 3American Academy of Allergy, Asthma & Immunology — Oral Allergy Syndrome (OAS)
- 4MedlinePlus — Toothache (National Library of Medicine)
- 5World Health Organization — Oral Health Fact Sheet
This content is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. It cannot tell you what is causing your tooth pain or whether it is an allergy. If you have any emergency sign — trouble breathing, fast-spreading swelling, sudden weakness or confusion, or severe pain — call 911 or go to the nearest emergency room. For anything that is new, worsening, or persistent, see a licensed healthcare provider. Curex focuses on at-home allergy testing and immunotherapy, which is not the appropriate care for this symptom and never a substitute for a clinician.