A cracked tooth does not always announce itself with obvious pain. Sometimes it is a fleeting sharp sensation when you bite down on something. Sometimes it is sensitivity that appears out of nowhere and then disappears. The tricky part is that cracked teeth are often hard to see, hard to pinpoint, and easy to dismiss until the crack progresses.
Here is how to recognise a cracked tooth and what to do about it.
Types of tooth cracks
Not all cracks are the same. The type determines the treatment and the outlook.
Craze lines. These are tiny, shallow cracks in the outer enamel only. They are extremely common in adults, often visible as faint vertical lines on front teeth. They do not cause pain, do not progress into the inner tooth, and do not require treatment. They are a cosmetic concern only.
Fractured cusp. A piece of the chewing surface breaks off, usually around a filling. This typically does not affect the nerve and is repaired with a new filling or a crown.
Cracked tooth. A crack extends from the chewing surface vertically towards the root but has not yet split the tooth in two. This is the most common type that causes symptoms. It can often be saved with a crown, though root canal treatment may be needed if the crack has reached the nerve.
Split tooth. The crack has progressed through the entire tooth, dividing it into two segments. In most cases, the tooth cannot be saved and extraction is necessary.
Vertical root fracture. A crack that starts in the root and extends upward. These are often painless initially and may be discovered when infection develops around the root. The prognosis is usually poor, and extraction is often the outcome.
Symptoms of a cracked tooth
Cracked tooth symptoms can be confusing because they are often intermittent and hard to localise.
Pain when biting. This is the hallmark symptom. A sharp pain when you bite down, particularly on hard or chewy food, that goes away when you release. The pain occurs because biting opens the crack slightly, irritating the nerve inside.
Sensitivity to temperature. Hot drinks, cold water, or cold air may trigger a sharp zing that lingers for several seconds. This suggests the crack has reached the dentine layer or the nerve.
Pain that comes and goes. Unlike a cavity (which tends to produce consistent, escalating pain), a cracked tooth often causes pain that appears and disappears. You might have a bad day followed by a week with no symptoms. This intermittent pattern is characteristic.
Difficulty pinpointing the tooth. Patients often say "something on this side hurts, but I cannot tell which tooth." Cracks can refer pain across adjacent teeth and along the jaw, making localisation difficult.
Swelling around the gum. If the crack has allowed bacteria to enter the nerve chamber, infection can develop. A small swelling or pimple on the gum near the tooth suggests an abscess has formed.
If you notice any of these, book an appointment. Waiting rarely improves the outcome with cracks. It usually makes treatment more complex.
What causes teeth to crack
Biting forces. Chewing ice, hard lollies, popcorn kernels, or using teeth as tools (opening bottles, tearing packaging) can fracture teeth.
Teeth grinding. Chronic bruxism subjects teeth to repeated excessive force. Over time, this can fatigue the tooth structure and cause cracks, particularly on back teeth with large fillings.
Large fillings. A tooth with a large filling has less natural structure supporting it. The remaining walls are thinner and more prone to flexing and cracking under load.
Temperature shock. Eating something very hot followed immediately by something very cold (or vice versa) can cause thermal stress fractures, though this is relatively uncommon.
Age. Teeth become more brittle with age. Cracks are most commonly diagnosed in patients over 40.
Trauma. A blow to the face from sports, an accident, or a fall can crack teeth. Wearing a mouthguard during contact sports reduces this risk.
How cracked teeth are diagnosed
Cracks can be difficult to detect. They often do not show on standard X-rays. Your dentist may use several techniques.
Bite test. You bite down on a small stick or rubber pad placed on individual cusps of the tooth. If biting on a specific cusp reproduces the pain, it narrows down which tooth and where the crack may be.
Transillumination. A bright light is shone through the tooth. Cracks interrupt the light path and can sometimes be seen as a line or shadow.
Magnification. Dental loupes or a microscope can reveal cracks that are invisible to the naked eye.
Dye testing. A special staining dye is applied to the tooth surface. It seeps into cracks and highlights them when rinsed away.
Exploratory. In some cases, an old filling is removed to inspect the tooth floor for cracks directly. This is done when other methods are inconclusive and symptoms are persistent.
Treatment options
Treatment depends on the type and extent of the crack.
Bonding. For minor cracks on front teeth or small chips, composite bonding can seal the crack and restore the tooth shape. This starts from $250 per tooth.
Crown. For cracked teeth where the structure is compromised but the nerve is unaffected, a crown holds the tooth together and prevents the crack from spreading further. A crown covers the entire visible portion of the tooth and starts from $1,600 per tooth at Ivy Dental.
Root canal plus crown. If the crack has reached the nerve and caused irreversible inflammation or infection, root canal treatment is needed to remove the damaged nerve before the crown is placed. Root canal costs vary from $900 to $1,800 depending on the tooth.
Extraction. If the tooth is split, or a vertical root fracture is confirmed, extraction may be the only option. The missing tooth can then be replaced with an implant, bridge, or other option. Read about missing tooth replacement options.
Indicative pricing. Your quote may differ based on clinical assessment.
What to do right now if you suspect a crack
- Avoid chewing on that side.
- Do not apply extreme temperatures to the area.
- Take over-the-counter pain relief if needed.
- Book a dental appointment as soon as possible. At Ivy Dental, we see emergency patients seven days a week at our Everton Park and Nundah clinics.
Prompt assessment may preserve more treatment options. Cracks can progress, although the timing and appropriate treatment depend on the tooth and the extent of the damage.
Book an assessment at Ivy Dental. Book a consultation, or call (07) 3266 7120.
