Tooth pain under a crown: causes and whether treatment is possible without removing it

Can a tooth hurt under a crown?

A crowned tooth can hurt because the crown only covers it: living pulp or a root with filled canals remains beneath, with gum and bone around it. Australia’s Healthdirect explains that the crown itself cannot decay, but the underlying tooth can. It lists decay around or under a crown, fracture of the underlying tooth and sore or swollen gums as complications.

Healthdirect also notes that an ill-fitting crown can cause pain or difficulty chewing. Cleveland Clinic adds that a newly crowned tooth may be sensitive, particularly in the first few weeks after fitting.

Each cause needs different management, so treatment starts by establishing exactly what hurts. The next table sets out symptoms that help with this initial assessment.

Why does a crowned tooth hurt? Common causes

Pain under a crown has several common causes, each associated with a different pattern of symptoms. The table combines American Association of Endodontists (AAE) terminology with descriptions of crown complications from Healthdirect and Cleveland Clinic.

This is a guide, not a means of self-diagnosis. Pain on biting can result from a high crown, root infection or a fracture; only examination and an X-ray distinguish them.

Pulp inflammation and death under a crown: what causes them?

Pulp inflammation under a crown has several possible causes. The AAE lists deep decay, extensive restorations and cracks as typical causes of irreversible pulpitis. A crowned tooth has usually had substantial decay and preparation on all sides. In a 2005 study by Cheung et al., with average follow-up of about 14 years, 15.6% of vital teeth with single metal-ceramic crowns needed treatment for endodontic reasons.

The same researchers report pulp survival of 84.4% at 10 years and 81.2% at 15 years; for bridge abutments it was lower, at 70.8% and 66.2%. These teeth were treated in the 1980s, so the results indicate the scale of the issue rather than an individual’s risk.

The AAE describes a tooth that initially reacted to hot and cold after a gold crown was fitted, then developed spontaneous pain. Irreversible pulpitis was diagnosed and root canal treatment through the crown recommended. Pulp can also die painlessly; root infection may only become apparent on an X-ray or as a gum pimple.

Decay under a crown: how does it develop and how is it detected?

Decay usually starts at the crown margin, where crown and tooth meet by the gum. Cleveland Clinic explains that an ill-fitting crown can trap bacteria and cause decay. A 2018 review by Vagropoulou et al. identifies decay and ceramic fractures as the main problems with crowns, inlays and onlays.

Decay beneath a crown may remain painless for a long time; once it reaches the pulp, symptoms of pulp inflammation or root infection develop. The dentist examines the crown margin and looks for decay on X-rays, including bitewings, which the AAE lists among investigations for toothache.

In an AAE case involving a crowned molar with a gum sinus tract and marginal decay, crown removal, root canal treatment and a new crown were recommended. Healthdirect reminds patients to clean crowned teeth as carefully as other teeth and maintain healthy gums.

Pain under a crown when biting: the bite, the root or a fracture?

Pain on biting has three main possible sources: a high or ill-fitting bite contact, inflammation around the root tip or a root fracture. The AAE calls pain on biting and tapping symptomatic apical periodontitis, and states that severe tapping pain strongly suggests dying pulp requiring root canal treatment.

Pain beginning on the day a new crown is cemented may relate to the bite, as Healthdirect lists an ill-fitting crown among causes of pain and chewing problems. Pain increasing years after fitting, especially in a root-treated tooth, needs an X-ray and root assessment.

The European Society of Endodontology (ESE) 2025 position statement links vertical root fracture to a narrow, deep pocket at one site and multiple sinus tracts near the gum margin. It adds that removing the existing restoration helps assess whether a fracture is present and its extent; the cracked tooth article explains further.

How does a dentist investigate pain under a crown?

A dentist uses the history, tests and X-rays to establish the cause: the crown cannot simply be seen through. AAE diagnostic guidance recommends comparing tests with neighbouring healthy teeth and not starting treatment until the diagnosis is clear.

Increasing facial swelling or a fever needs urgent same-day assessment. If swelling makes breathing, speaking or swallowing difficult, go to an emergency department (SOR) immediately or call 112.

• History: when pain began, whether spontaneous, on biting, with cold or at night.
• Assessment of the crown and gum margin and measurement of pockets around the tooth.
• Cold pulp tests, tapping, palpation and bite testing of each cusp.
• At least two new intraoral X-rays and a bitewing.
• Bite assessment when pain began after fitting a new crown.
• Small-field CBCT if X-rays do not explain symptoms, for example with a suspected root fracture.

Treatment through a crown or crown removal: what determines the choice?

Root canal treatment can often be performed through an opening in the crown. Removal is needed if there is decay underneath, the crown leaks or a fracture needs assessment. In the AAE case of pulpitis under a gold crown, treatment was performed through the crown and the opening sealed with a permanent filling.

For decay at the crown margin, the AAE recommends crown removal, dental treatment and a new crown. Removal also gives a clearer view of the tooth but usually means a new crown is needed after treatment; a temporary crown protects it until then.

If a tooth with a post and core needs root canal retreatment, the post must first be removed. If this risks fracturing the root, the dentist considers root-end surgery, as described in the article on root canal retreatment.

What determines the cost of treating a tooth under a crown?

Cost depends on the cause and whether the crown can be retained. Bite adjustment, root canal treatment through a crown and crown removal followed by treatment, rebuilding and a new crown are priced differently.

The clinic’s price list gives “Zdjęcie korony” (crown removal) at 300 zł, “Zacementowanie korony” (crown cementation) at 250 zł, “Korona tymczasowa” (temporary crown) at 250 zł, “Usunięcie wkładu koronowo-korzeniowego” (post and core removal) at 350 zł and “Korona pełnocyrkonowa” (full-zirconia crown) at 3 000 zł. Root canal costs depend on the number of canals. The dentist determines the final scope and cost after examination; prices may change.

For adults without special entitlements, the NFZ, Poland’s National Health Fund, funds root canal treatment only for incisors and canines, tooth positions 1 to 3. Pregnant women and women in the postpartum period are entitled to root canal treatment of all teeth, including back teeth. Prosthetic crowns are not funded (legal status as of 24 October 2026).

• Cause of pain: bite, pulp, decay, sinus tract or root fracture.
• Whether treatment is possible through the crown or it must be removed.
• Number of canals and presence of a post and core.
• Type of new crown if the old one cannot be refitted.

How it works at DentalBlue

At DentalBlue in Białystok, a crowned tooth can be assessed at a “Wizycie z bólem” (visit in pain), including a panoramic X-ray, consultation, examination and pain relief, priced at 340 zł. The clinic’s own radiology unit takes intraoral X-rays and CBCT scans. Root canal treatment and retreatment are performed under a microscope; crowns are made within the clinic’s prosthodontic service, allowing tooth treatment and a new crown to be planned together. The dentist determines the final scope and cost after examination; prices may change.