Tooth Pain Under Crown Comes and Goes: Causes & What to Do

Unlike a constant, throbbing toothache, intermittent crown pain can be tricky to diagnose because it disappears before you can pin it down. But the on-and-off pattern itself is a clue.

Pain that comes and goes typically means the underlying problem is position-dependent, temperature-dependent, or pressure-dependent. It flares up when you trigger it—biting at a certain angle, eating something hot or cold, or clenching your jaw at night—and fades when the trigger stops.

This pattern is common with:

• Early-stage nerve inflammation that hasn't yet become irreversible


• A crown that doesn't fit perfectly, creating intermittent pressure on the bite


• Micro-leakage around the crown margins that allows occasional bacterial access


• Gum recession that periodically exposes sensitive root surfaces


• Teeth grinding that stresses the tooth only during sleep

Understanding the pattern of your pain—what triggers it, how long it lasts, and what makes it go away—is the first step toward identifying the cause and getting proper treatment.

If your tooth pain under a crown comes and goes, one of these causes is most likely responsible:

While some intermittent crown pain can wait for a regular dental appointment, certain symptoms indicate a more urgent problem:

See your dentist within a few days if:

• Pain has been recurring for more than 2 weeks


• Sensitivity to hot or cold lingers for more than 30 seconds after the trigger is removed


• You notice a dark line or discoloration at the gum line around the crown


• The crown feels loose or rocks when you push on it


• You have persistent bad breath or a bad taste near the crown

Seek prompt dental care (same day or next day) if:

• Pain is becoming more frequent or more intense over time


• You notice swelling in the gum near the crown or in your face


• You have a fever along with the tooth pain


• Pain has become constant rather than intermittent


• You see pus draining from the gum near the crown

Call 911 or go to the ER if:

• Swelling is spreading to your eye, neck, or floor of your mouth


• You have difficulty breathing or swallowing


• You have a high fever (over 101°F/38.3°C) with facial swelling

An untreated dental infection under a crown can spread and become life-threatening. If your intermittent pain has progressed to constant pain with swelling, don't wait.

Diagnosing the cause of intermittent crown pain requires a systematic approach because several conditions can produce similar symptoms:

Bite analysis: Your dentist will use thin articulating paper to identify any high spots where the crown contacts opposing teeth unevenly. Even a tiny discrepancy of 0.1mm can cause pain.

Percussion and palpation: Gently tapping on the crown and pressing on the surrounding gums helps determine whether the problem is in the tooth, the root, or the supporting tissues.

Cold and heat testing: Applying temperature stimuli to the crowned tooth and neighboring teeth helps assess nerve health and identify whether the tooth's nerve is inflamed, dying, or already dead.

Bite stick test: Biting down on a special stick and releasing helps identify cracks. A cracked tooth often hurts more on release than on initial bite.

X-rays: A periapical X-ray reveals the condition of the root, the fit of the crown, any decay at the margins, and whether there's infection at the root tip. Your dentist may compare these with older X-rays to track changes.

CBCT scan: When standard X-rays aren't conclusive, a 3D cone-beam CT scan can reveal hairline fractures, hidden decay, and the exact extent of any infection. This advanced imaging has become the standard of care for complex diagnostic cases.

Transillumination: Shining a bright light through the tooth can reveal cracks that are invisible on X-rays. The light stops at a fracture line, creating a visible shadow.

The right treatment depends entirely on what's causing the pain:

Bite adjustment — If the crown is too high, your dentist can reshape the biting surface in a quick, painless appointment. This is the simplest fix and often resolves the pain immediately. There is usually no charge for a bite adjustment on a recently placed crown.

Desensitizing treatment — For mild sensitivity from gum recession or reversible pulpitis, fluoride varnishes, desensitizing agents, or prescription-strength toothpaste can reduce nerve sensitivity over time.

Crown replacement — If the crown is cracked, has lost its seal, or has decay underneath, a new crown will be needed. Your dentist will remove the old crown, treat any decay, and fit a new crown. Cost: $800-$1,800 depending on material and location.

Root canal — If the nerve inside the tooth is irreversibly inflamed or infected, a root canal removes the damaged nerve and seals the canals. A new crown is typically placed afterward. Cost: $700-$1,500 for the root canal, plus the crown.

Root canal retreatment or apicoectomy — If a previous root canal has failed, retreatment or surgical root-end treatment can save the tooth. Cost: $750-$1,500 for retreatment, $900-$1,300 for apicoectomy.

Night guard — For bruxism-related pain, a custom night guard protects the crown from grinding forces. Cost: $300-$800 for a custom-fitted guard from your dentist, though over-the-counter options ($20-$50) can provide temporary relief.

Extraction — When the tooth cannot be saved (vertical root fracture, extensive decay, or failed previous treatments), extraction followed by an implant, bridge, or partial denture may be the best option.

If you're waiting for a dental appointment, these measures can help manage intermittent crown pain:

Over-the-counter pain relief:

• Ibuprofen (Advil, Motrin): 400-600mg every 6-8 hours reduces both pain and inflammation. Do not exceed 2,400mg in 24 hours.


• Acetaminophen (Tylenol): 500-1,000mg every 6-8 hours. Can be alternated with ibuprofen for better pain control. Do not exceed 3,000mg in 24 hours.

Desensitizing toothpaste: Apply a thin layer of toothpaste containing potassium nitrate (such as Sensodyne) directly to the sensitive area before bed. Leave it on overnight. This can reduce nerve sensitivity over several days of use.

Avoid triggers: If you've identified what triggers the pain—cold drinks, biting hard foods, sweet foods—avoid those triggers until you can see your dentist.

Salt water rinse: Mix 1/2 teaspoon of salt in 8 ounces of warm water and gently rinse 2-3 times daily. This can reduce gum inflammation and help if infection is contributing to the pain.

Clove oil (eugenol): A small amount of clove oil applied to the gum near the painful crown can provide temporary numbing. Use sparingly, as it can irritate soft tissues if overused.

What NOT to do:

• Don't try to remove or adjust the crown yourself


• Don't place aspirin directly on the gum (causes chemical burns)


• Don't ignore pain that is getting progressively worse


• Don't assume the pain will resolve on its own if it's been more than 2-3 weeks

A properly fitted dental crown on a healthy tooth should be completely pain-free and can last 10-15 years or longer with proper care. Some crowns last 25-30 years.

Factors that determine crown lifespan:

• Crown material — All-ceramic crowns may chip over time, while porcelain-fused-to-metal (PFM) and zirconia crowns tend to be more durable for back teeth


• Oral hygiene — Brushing, flossing, and regular dental visits prevent decay at the crown margins


• Bite forces — Heavy clenching or grinding shortens crown life


• Fit quality — A well-fitted crown with proper margins resists bacterial invasion


• Underlying tooth health — A strong, healthy tooth underneath supports the crown better

Steps to maximize crown longevity:

• Brush twice daily with fluoride toothpaste, paying extra attention to the gum line around the crown


• Floss daily around the crown, sliding the floss gently below the gum line


• Wear a night guard if you grind your teeth


• Avoid chewing ice, hard candy, and other extremely hard objects


• See your dentist every 6 months for checkups and professional cleaning


• Address any bite changes or discomfort promptly rather than waiting