Crown Sensitivity: Causes & When to Act

Crown Sensitivity Is Not Normal: When to Investigate

Persistent sensitivity after a dental crown should not be dismissed as normal. While mild sensitivity for 1 to 2 weeks after crown placement is a common and expected response as the tooth adjusts, sensitivity that persists beyond 2 weeks, worsens over time, or occurs spontaneously indicates an underlying problem that requires diagnosis and treatment. The most common causes are a high bite, cement irritation, nerve inflammation (pulpitis), decay under the crown, or a cracked tooth — and each has a specific treatment.

Research published in the Journal of Endodontics indicates that persistent post-crown sensitivity has an identifiable and treatable cause in over 90% of cases. Ignoring the problem allows it to progress, potentially leading to irreversible nerve damage, infection, or tooth loss. At Townsville Dental Clinic, we encourage patients across North Queensland to report any ongoing crown sensitivity promptly so we can intervene early and preserve the tooth.

Normal Sensitivity vs Abnormal Sensitivity

Understanding the difference between expected post-crown sensitivity and abnormal sensitivity is critical. The table below outlines the key distinctions.

If your symptoms fall into the right-hand column, contact your dentist for a review appointment rather than waiting to see if the pain resolves on its own.

Cause 1: High Bite (Occlusal Interference)

A high bite is the most common and most easily correctable cause of post-crown sensitivity. It occurs when the new crown sits slightly too tall, causing it to contact the opposing tooth before the rest of your teeth meet. This concentrates all the biting force onto a single tooth — forces that can exceed 400 to 800 newtons on a molar.

Symptoms of a high bite:

• Pain or tenderness when biting or chewing on the crowned tooth
• A feeling that the crown “hits first” when you close your teeth together
• Aching or throbbing in the crowned tooth after meals
• Sensitivity that began immediately after the crown was cemented

Treatment: Your dentist uses articulating paper (bite paper) to identify the high spot and adjusts the crown surface using a handpiece. This removes a fraction of a millimetre of material and typically takes less than 10 minutes. A study published in the British Dental Journal found that bite adjustment alone resolved post-crown sensitivity in over 70% of patients presenting with discomfort after crown placement.

At Townsville Dental Clinic, we perform careful bite checks at the fitting appointment, but the bite can feel different once anaesthesia wears off. We always encourage patients to return for a complimentary bite adjustment if anything feels off.

Cause 2: Cement Irritation

The cement used to bond the crown to the tooth can cause a temporary inflammatory response in the dental pulp. This is more common with certain cement types — particularly resin-based cements that require acid etching — and in teeth where the remaining tooth structure is thin, allowing chemical irritation to reach the nerve.

Symptoms of cement irritation:

• Sensitivity to cold that appeared after the crown was cemented
• Mild, diffuse aching around the crowned tooth
• Symptoms that are stable (not worsening) but not resolving

Treatment: In most cases, cement-related sensitivity resolves within 2 to 4 weeks as the pulp recovers. If it persists, your dentist may apply a desensitising agent or, in rare cases, remove and re-cement the crown with a less irritating cement. Research published in Operative Dentistry reports that pulpal inflammation from cement is reversible in approximately 85 to 90% of cases.

Cause 3: Reversible Pulpitis (Nerve Inflammation)

The crown preparation process — removing 1 to 2 millimetres of enamel and dentine from all surfaces — generates heat and mechanical trauma near the dental pulp. In some cases, this causes reversible pulpitis, a temporary inflammation of the nerve that produces heightened sensitivity.

Symptoms of reversible pulpitis:

• Sharp sensitivity to cold that resolves within a few seconds of removing the stimulus
• Sensitivity to sweet foods or drinks
• No spontaneous pain (pain only occurs with a trigger)
• Gradual improvement over days to weeks

Treatment: Reversible pulpitis typically resolves on its own within 2 to 6 weeks. Your dentist may recommend a desensitising toothpaste containing potassium nitrate (such as Sensodyne) and avoiding temperature extremes on that side. If the sensitivity does not resolve or transitions to spontaneous pain, it may have progressed to irreversible pulpitis.

Cause 4: Irreversible Pulpitis (Nerve Damage)

When the pulp inflammation becomes severe enough that the nerve cannot recover, the condition is classified as irreversible pulpitis. This is a more serious diagnosis that requires root canal treatment to resolve. Approximately 5 to 8% of crowned teeth eventually develop irreversible pulpitis, according to a systematic review published in the International Endodontic Journal.

Symptoms of irreversible pulpitis:

• Spontaneous, throbbing pain that occurs without any trigger
• Prolonged sensitivity to heat (pain lasting 30 seconds or more after the heat source is removed)
• Pain that wakes you from sleep
• Pain that is not fully relieved by over-the-counter painkillers
• Pain that has been worsening progressively

Treatment: Root canal treatment is required to remove the damaged nerve tissue and eliminate the infection. The crown may need to be removed to access the tooth, or in some cases, root canal treatment can be performed through a small hole drilled in the top of the crown, which is then sealed. The existing crown can often be retained after root canal treatment.

Cause 5: Decay Under the Crown (Secondary Caries)

A crown protects the visible portion of a tooth, but the junction where the crown margin meets the natural tooth remains vulnerable to plaque accumulation and decay. If bacteria infiltrate this junction — due to poor oral hygiene, a poorly fitting crown, or cement washout — secondary caries can develop beneath the crown.

Symptoms of decay under a crown:

• Sensitivity that develops months or years after the crown was placed (not immediately after)
• A dark shadow visible at the gum line around the crown
• Bad taste or odour near the crowned tooth
• The crown feeling loose or mobile

Treatment: The crown must be removed so the decay can be assessed. If sufficient tooth structure remains after removing the decay, a new crown is fabricated. If the decay has reached the nerve, root canal treatment is required before re-crowning. In severe cases where the tooth is compromised beyond repair, extraction may be necessary.

Cause 6: Cracked Tooth or Root Fracture

A crack in the natural tooth beneath the crown — or a fracture of the root — can cause intermittent, sharp sensitivity that is difficult to pinpoint. Cracks may have been present before the crown was placed or may develop afterward due to heavy biting forces or bruxism.

Symptoms of a cracked tooth under a crown:

• Sharp, shooting pain when biting on certain foods or at certain angles
• Pain that is erratic — sometimes present, sometimes absent
• Sensitivity to cold but not heat (in early stages)
• Pain on release of biting pressure (rebound pain)

Treatment: Diagnosis requires careful clinical testing and sometimes a cone-beam CT (CBCT) scan to identify the crack. If the crack is confined to the crown of the tooth, root canal treatment and a new crown may save the tooth. If the crack extends below the gum line or into the root, extraction is usually necessary.

When to Contact Your Dentist Urgently

Certain symptoms warrant urgent attention rather than a routine review appointment:

• Spontaneous throbbing pain — suggests irreversible pulpitis or infection
• Swelling of the gum or face near the crowned tooth — suggests abscess formation
• A pimple or bubble on the gum (sinus tract) — indicates a draining infection
• Fever or malaise associated with dental pain — suggests spreading infection
• The crown has come off — the exposed prepared tooth is vulnerable to fracture, decay, and shifting

If you experience any of these symptoms, contact Townsville Dental Clinic immediately for an emergency assessment.

Diagnostic Tests Your Dentist Will Perform

When you present with persistent crown sensitivity, your dentist will use several diagnostic tests to identify the cause:

Key Takeaway

Mild sensitivity for 1 to 2 weeks after a new crown is expected — but persistent, worsening, or spontaneous sensitivity is not normal and should be investigated promptly. The cause is identifiable and treatable in over 90% of cases, and early intervention prevents the problem from progressing to nerve damage, infection, or tooth loss. If your crowned tooth is still sensitive after 2 weeks, do not wait — book a review appointment at Townsville Dental Clinic so we can diagnose and resolve the issue.

Sources: Journal of Endodontics; Journal of Prosthetic Dentistry; British Dental Journal; International Endodontic Journal; Operative Dentistry.