Why Does My Tooth Hurt? Common Causes and How to Get Relief

A toothache most often comes from decay, a cracked tooth, an infection, exposed dentin, sinus pressure, or grinding — and each has its own telltale feel. A toothache is a signal, not a diagnosis, so identifying the pattern is the first step toward the right relief.

What causes tooth pain?

Tooth pain traces back to one of a handful of causes, and the type of pain usually narrows it down. Sharp pain with sweets points to decay; lingering throb points to infection; a zing that fades points to exposed dentin.

Tooth decay

Decay is the most common culprit, especially once it reaches the sensitive inner layers.

Feels like: sharp pain triggered by sweet, hot, or cold foods.

A cracked tooth or loose filling

A crack or failing filling flexes under load, irritating the nerve.

Feels like: sharp pain when you bite down or release the bite.

Infection or abscess

An infection at the root produces pus and pressure. This is often a tooth abscess and needs prompt care.

Feels like: a throbbing, lingering ache, especially with swelling, fever, or a bad taste.

Worn enamel or gum recession

Exposed dentin lets triggers reach the nerve briefly. If this sounds familiar, see our guide to sudden tooth sensitivity.

Feels like: a quick zing to hot, cold, or sweet that fades fast.

Sinus pressure

Pain in the upper back teeth is sometimes sinus pressure in disguise, because the roots sit close to the sinus floor.

Feels like: a dull, pressure-like ache that worsens when you bend forward.

Grinding (bruxism)

Clenching overloads the teeth and jaw muscles overnight.

Feels like: a sore jaw, morning headache, and generalized tooth soreness.

How can I relieve tooth pain at home?

Ease a toothache temporarily with OTC pain relievers, a cold compress, and warm salt-water rinses while you wait for an appointment. These calm symptoms; they do not treat the cause, so still book a visit.

• Over-the-counter pain relievers such as ibuprofen or acetaminophen
• Cold compress against the cheek to ease swelling
• Warm salt-water rinse to soothe gums and clean the area
• Avoid very hot, cold, or sugary foods on the painful side
• Clove oil dabbed on the area, which provides genuine mild numbing

What should you avoid with a toothache?

Avoid anything that damages tissue or lets the problem worsen. Two common home mistakes actually make things worse rather than better.

• Don't place aspirin directly on the gum — it burns the soft tissue
• Don't ignore the pain hoping it passes, because toothaches rarely resolve for good
• Don't chew on the painful side

When should I see a dentist immediately?

Seek same-day care for pain with fever or facial swelling, pain that wakes you at night, or a cracked or knocked-out tooth. These signal infection or structural damage that worsens quickly without treatment.

• Pain with fever, facial swelling, or trouble swallowing
• Pain that wakes you up at night
• A knocked-out or significantly cracked tooth
• Severe pain that won't respond to OTC relief

For sudden trauma or spreading swelling, follow our emergency dental guide.

When should I book soon but not same-day?

Book within a few days for milder, stable symptoms that aren't escalating. These still need care, but they don't carry the same urgency.

• A persistent dull ache
• Sensitivity that won't resolve with home care
• A lost filling without pain
• Mild discomfort when biting

At Cosmetic Dentistry Center NYC on Park Avenue, Dr. Pia Lieb diagnoses the source of the pain before treating it, so the fix addresses the cause rather than just quieting the symptom.

Frequently asked questions

Why does my tooth hurt only at night?

Lying down increases blood flow to the head, which can intensify pain from inflammation or infection. Nighttime pain can also signal grinding, which a custom night guard relieves.

Can a sinus infection cause a toothache?

Yes. Pressure from inflamed sinuses refers to the upper molars and mimics a toothache.

Why is my tooth sensitive to cold but nothing else?

Usually worn enamel, gum recession, or a small cavity exposing the dentin. Brief, fading sensitivity is common; lingering pain is not.

How long should I wait before seeing a dentist?

Don't wait beyond 48–72 hours for a persistent toothache, and seek same-day care for severe pain or swelling.

What's the bottom line on tooth pain?

Home remedies treat symptoms, not causes, and a toothache rarely resolves itself for good. Because early diagnosis usually means a simpler, less expensive fix, treat persistent or severe pain as a reason to be seen promptly.

This article is for educational purposes only and is not a substitute for professional dental advice.