Top 6 Reasons Your Tooth Has Been Hurting You

Tooth pain can come from decay, a damaged restoration, a crack, exposed roots or inflammation inside a tooth. The pattern helps guide a dental examination, but symptoms alone cannot confirm a diagnosis.

Not all tooth pain is the same. The type, timing, and triggers of a toothache often point to very different underlying causes—and different treatments. Understanding these patterns helps your dentist identify the problem more quickly and get you relief sooner.

Why does my tooth hurt briefly with hot or cold foods?

What it usually means
Brief sensitivity does not identify the cause by itself. Short-lived sensitivity is often caused by gum recession, a small cavity, exposed root surfaces, or a filling that is beginning to leak.

What helps
Desensitizing toothpaste can significantly reduce symptoms, especially for cold sensitivity. These products require consistent use and may take up to two weeks to reach full effectiveness. If sensitivity persists or worsens, a dental evaluation is recommended to rule out underlying decay or restoration issues.

Why is my tooth sensitive after dental treatment?

What it usually means
Dental procedures can temporarily irritate the nerve inside a tooth. Sensitivity to hot or cold after treatment is common and often resolves as the tooth settles.

What helps
Recovery varies with the procedure and the tooth. Read our guide to tooth pain after a filling. If sensitivity is increasing, lingering, or accompanied by biting pain, your dentist should evaluate the area to ensure the bite and restoration are functioning properly.

Why does my tooth hurt when I bite or chew?

What it usually means
Pain with pressure often suggests a crack or fracture in the tooth. It can also indicate inflammation around the root or an early dental abscess. In some cases, the bite may be uneven following recent dental work.

What helps
This type of pain should be evaluated promptly. Depending on the cause, treatment may involve adjusting the bite, placing a crown, or performing root canal therapy to address infection or nerve involvement.

What does lingering pain after hot or cold mean?

What it usually means
Pain that continues for several seconds or minutes after temperature exposure often indicates that the tooth’s nerve is inflamed or beginning to fail.

What helps
This type of pain frequently requires root canal treatment to remove the damaged nerve and relieve symptoms. Early evaluation can prevent worsening infection and reduce the risk of complications.

Is severe tooth pain with swelling urgent?

What it usually means
Severe, unrelenting pain—especially when accompanied by swelling, pressure, or tenderness—often signals a dental infection at the root of the tooth. In many cases, the nerve has already died.

What helps
Dental infections should be treated urgently. Treatment depends on the diagnosis and may involve drainage, root canal therapy or extraction. Antibiotics are used when indicated; they do not replace treatment of the source. Delaying treatment can allow infection to spread and, in rare cases, become medically serious.

Can sinus pressure feel like a toothache?

What it usually means
Sinus infections can closely mimic tooth pain, particularly in the upper back teeth. The maxillary sinuses sit just above these teeth, and sinus inflammation can create pressure that feels dental in origin.

What helps
A dental evaluation can determine whether the pain is coming from the teeth or the sinuses. If dental causes are ruled out, your physician can advise whether treatment for a sinus condition is appropriate.

When to Schedule an Evaluation

Tooth pain is rarely something to ignore. If discomfort is persistent, worsening, or interfering with daily activities, a professional examination is the best way to identify the cause and determine appropriate treatment. Early diagnosis often means simpler, more comfortable solutions.

Where can I have tooth pain evaluated in Jacksonville?

C.J. Henley, DMD sees patients at 3675 Hendricks Avenue, Jacksonville, FL 32207, near San Marco. Contact the office to describe when the pain began, what triggers it and whether you have swelling. For a problem that needs prompt attention, review our emergency dental care information.

When should I seek emergency medical help?

Difficulty breathing or swallowing, or rapidly spreading facial or neck swelling, requires emergency medical care. Call 911 or go to an emergency department rather than waiting for a dental appointment.

Further reading: American Association of Endodontists: tooth pain.

Updated October 1, 2026