Why Does My Tooth Hurt? 7 Common Causes of Tooth Pain

Tooth pain is your body's smoke alarm: sometimes it is burnt toast, sometimes it is a fire. The pattern of the pain — when it happens, how long it lasts, what triggers it — usually points to one of seven causes. Here is what each one feels like and what to do about it.

1. A cavity that has reached the nerve's neighborhood

Feels like: pain when eating sweets, lingering ache after hot or cold, or a tooth that has started catching food.

Small cavities are usually painless — by the time a tooth hurts, decay has often traveled deep enough to irritate the nerve. Caught early, the fix is a simple tooth-colored filling. Wait too long and the same tooth may need a root canal and crown. This is the single best argument for treating tooth pain sooner rather than later: the repair only gets bigger.

2. Sensitivity from worn enamel or receding gums

Feels like: a quick, sharp zing with cold drinks, cold air, or whitening toothpaste — gone within seconds.

When enamel wears thin or gums recede, the softer layer underneath (dentin) is exposed, and it telegraphs temperature straight to the nerve. Desensitizing toothpaste, a softer brush, and in-office fluoride or bonding over exposed roots usually calm it down. Brief and predictable is the key phrase here — if the pain starts lingering, it has probably graduated to a different item on this list.

3. A cracked tooth

Feels like: sharp pain when you bite down or release, often unpredictable, sometimes with cold sensitivity. You may not see anything in the mirror.

Cracks hide — they often will not show on an X-ray, and the tooth can look perfectly normal. We find them with a bite test and magnification. Treatment depends on depth: a shallow crack may need bonding or a crown; a crack into the root may mean the tooth cannot be saved, which is exactly why you should not "wait and see" on bite pain.

4. An abscess or infection

Feels like: constant throbbing, pain that wakes you at night, swelling, a bad taste, a pimple on the gum, or a tooth that is suddenly sensitive to pressure.

An abscess is an infection at the root tip or in the gum, and it does not resolve on its own — the pain may fade for a while, but the infection stays. This one is urgent: call us the same day at (302) 994-3093. If facial swelling is spreading or you have fever or trouble swallowing, go to the emergency room first. Our guide to dental emergencies in New Castle County covers what to do while you wait.

5. Gum disease

Feels like: sore, puffy gums that bleed when brushing; a dull ache around teeth rather than in them; loose teeth in later stages.

Early gum disease (gingivitis) is reversible with a professional cleaning and better home care. Advanced gum disease (periodontitis) destroys the bone that holds teeth in and needs deeper treatment. If your gums bleed every time you brush, that is not "normal for you" — it is stage one.

6. Grinding and clenching (bruxism)

Feels like: dull, generalized aching — often worse in the morning — plus a sore jaw, headaches, or flattened-looking teeth.

Many people grind at night without knowing it until a tooth cracks or a partner mentions the noise. A custom night guard is a small investment that protects every tooth in your head. Stress management genuinely helps too.

7. Sinus pressure masquerading as a toothache

Feels like: aching in several upper back teeth at once, worse when you bend over or during a cold or allergy flare.

The roots of your upper molars sit just below your sinuses, so sinus congestion can push on them and mimic a toothache convincingly. If several upper teeth hurt equally and you are congested, treat the sinuses first — but if one specific tooth stands out or the pain outlasts the cold, have it checked.

When tooth pain is an emergency

• Call us the same day: constant throbbing, pain that wakes you up, swelling, a broken tooth, or pain on biting that is getting worse.
• Go to the ER first: swelling spreading toward the eye or neck, fever with facial swelling, or any trouble breathing or swallowing.
• Book a regular visit: brief cold sensitivity, mild ache after a long day of clenching, or bleeding gums.

The one rule that saves teeth

Pain that goes away on its own did not fix itself — nerves that die stop reporting. A tooth that hurt for a week and then went quiet is often more damaged than one that still hurts. If a tooth has been talking to you, let us take a look and an X-ray. It is a short visit, and it is how a $200 problem stays a $200 problem.

Call (302) 994-3093 or request an appointment online — we keep room in the schedule for same-day pain visits whenever we can.