Why Does a Crowned Tooth Start Hurting Later?
A dental crown covers and protects a damaged tooth, but the living tissue inside the tooth (the dental pulp) remains underneath. Over time, that tissue can become irritated, infected, or damaged for several reasons. The crown itself can also develop problems at its margins where it meets the tooth.
Some sensitivity in the first few weeks after a crown is placed is normal as the tooth adjusts. But pain that starts months or years later signals a new problem that needs attention. The cause determines the treatment, so accurate diagnosis is the first priority.
Common Causes of Crown Pain Months Later
Several distinct problems can cause a crowned tooth to become painful long after placement. Some involve the nerve inside the tooth. Others involve the crown itself or the gum tissue around it.
Nerve Inflammation or Infection
The dental pulp (the nerve and blood vessel tissue inside the tooth) can become inflamed or infected months or years after a crown is placed. This happens because the process of preparing a tooth for a crown involves removing tooth structure, which can stress the pulp. In some cases, the pulp recovers. In others, it slowly degenerates over time until it becomes symptomatic.
Signs of pulp problems include spontaneous pain (pain that starts without biting or temperature changes), lingering sensitivity to hot or cold that lasts more than a few seconds, and pain that wakes you up at night. These symptoms typically indicate that root canal treatment is needed.
Cracked Tooth Under the Crown
A tooth beneath a crown can develop a crack, especially if the tooth had a large filling before the crown was placed or if you grind your teeth. Cracks can extend into the pulp, causing sharp pain when biting, or they can propagate through the root, which may make the tooth unsalvageable.
Diagnosing a crack under a crown is challenging because the crown hides the tooth surface. An endodontist can use a dental operating microscope, CBCT imaging, and specialized tests to determine whether a crack is present and how far it extends.
Decay Under the Crown (Secondary Caries)
Bacteria can work their way under the edge of a crown over time, particularly if the crown margin does not fit precisely or if the cement seal breaks down. This secondary decay progresses beneath the crown where you cannot see or feel it until it reaches the pulp or weakens the tooth structure enough to cause pain.
Decay under a crown often shows up on X-rays as a dark shadow at the crown margin. In some cases, the crown must be removed to fully assess the extent of the decay. If the decay has reached the pulp, root canal treatment is needed before a new crown can be placed.
Bite Misalignment (High Crown)
If a crown sits even slightly higher than your natural bite, it absorbs more force than the surrounding teeth every time you chew or clench. This can cause a persistent ache, sensitivity to biting pressure, or pain in the jaw muscles near the crowned tooth. A bite that was fine initially can become a problem if the opposing teeth shift or if you develop grinding habits.
This is one of the simpler causes to fix. Your dentist can check the bite with articulating paper and make small adjustments to the crown surface. Relief is often immediate after the adjustment.
Gum Recession Around the Crown
If the gum tissue around a crowned tooth recedes, it can expose the root surface below the crown margin. Tooth roots are not covered by enamel, so the exposed surface is sensitive to temperature, touch, and acidic foods. This type of sensitivity is different from pulp pain. It is typically sharp and brief rather than lingering.
A periodontist can evaluate whether a gum graft is needed to cover the exposed root. In some cases, a desensitizing treatment or fluoride varnish provides adequate relief.
How an Endodontist Diagnoses the Problem
Because several different conditions can cause crown pain, accurate diagnosis requires more than just an X-ray. An endodontist is specifically trained to identify the source of tooth pain, including in teeth that have crowns.
Diagnostic Tests
The endodontist will perform several tests to determine whether the pulp inside the tooth is healthy, inflamed, or dead. Cold tests apply a cold stimulus to the tooth to see if the nerve responds normally. An electric pulp test sends a small electrical signal to check nerve vitality. Percussion testing (tapping on the tooth) checks for inflammation around the root tip.
CBCT imaging (a 3D X-ray) reveals details that standard dental X-rays miss, including cracks, root fractures, and infections around the root tips. The endodontist may also examine the tooth under a dental operating microscope for visual clues.
What the Diagnosis Might Reveal
- Irreversible pulpitis (inflamed nerve that will not recover): Root canal treatment is needed.
- Pulp necrosis (dead nerve) with infection: Root canal treatment is needed, possibly with antibiotics.
- Cracked tooth: Treatment depends on crack severity. Some cracks can be treated with a root canal and new crown. Others extend below the bone and may require extraction.
- Decay under the crown: The crown is removed, decay is treated, and a new crown is placed. Root canal may be needed if decay reached the pulp.
- Bite issue: Adjustment to the crown surface resolves the problem.
- Gum recession: Referral to a periodontist for gum tissue evaluation.
Treatment Options for a Painful Crown
Treatment depends entirely on the diagnosis. Here are the most common paths forward.
Root Canal Through an Existing Crown
In many cases, an endodontist can perform a root canal directly through the existing crown without removing it. The endodontist drills a small access hole through the top of the crown, removes the infected or damaged pulp, cleans and seals the root canals, and then fills the access hole. This approach preserves the crown and avoids the cost and time of crown replacement.
However, if the crown is old, poorly fitting, or if there is decay at the margins, the crown may need to be removed and replaced after the root canal.
Crown Replacement
If the crown itself is the problem (poor fit, broken seal, or decay at the margins), a new crown is needed. Your general dentist or a prosthodontist will remove the old crown, address any decay, and fabricate a new one. If root canal treatment was also needed, the new crown is typically placed 2 to 4 weeks after the root canal.
When Extraction Is Necessary
Some situations cannot be saved. A vertical root fracture that extends below the bone line, a crack that splits the root, or decay so extensive that not enough tooth structure remains to support a new crown may all lead to extraction. If extraction is necessary, the tooth can typically be replaced with a dental implant or bridge. An oral surgeon or periodontist performs the extraction, and a prosthodontist handles the replacement.
Cost of Treating Crown Pain
Treatment costs depend on the diagnosis. Costs vary by location, provider, and case complexity.
A bite adjustment is often a minor or no-cost procedure at your general dentist. Root canal treatment on a crowned tooth typically costs $800 to $1,500, depending on the tooth. A new crown costs $800 to $2,500. If extraction and an implant are needed, the total cost ranges from $3,000 to $6,000 or more.
Most dental insurance plans cover a portion of these procedures. Root canals are generally covered at 50-80% after deductible. Crowns may be subject to waiting periods or frequency limits (many plans allow a new crown on the same tooth only every 5-10 years). Check with your plan for specifics.
When to See an Endodontist
If you have pain in a crowned tooth that has persisted for more than a few days, schedule an evaluation. Specific warning signs that warrant prompt attention include spontaneous pain that comes and goes without a trigger, sensitivity to hot that lingers for more than 10 seconds, pain that wakes you at night, swelling near the crowned tooth, or a pimple-like bump on the gum near the tooth.
An endodontist is the specialist most qualified to diagnose problems inside a crowned tooth. Their training, microscopes, and 3D imaging allow them to identify issues that may not be visible on a standard dental X-ray. You can learn more on our endodontics specialty page at /specialties/endodontics.
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