What Is Cracked Tooth Syndrome
Cracked tooth syndrome describes the pain and sensitivity caused by a crack in a tooth that has not fully broken apart. The crack runs through the hard outer layers of the tooth, the tooth enamel and the dentin beneath it, but the pieces are still held together.
Because a crack can be very fine, the problem can be difficult to identify. Pain often comes and goes, and it can be hard to pinpoint which tooth is causing it.
In a large U.S. study reported in 2023, most of the cracked back teeth were molars, and nearly all already had a filling or other restoration.
Types of Cracked Teeth
Endodontic specialists recognize five types of cracks. The right treatment depends on which type is present, where the crack sits, and how far it extends.
Craze Lines
Craze lines are tiny, shallow cracks confined to the outer enamel. They are extremely common in adult teeth, cause no pain, and are a cosmetic concern only.
Fractured Cusp
A cusp is one of the raised points on the chewing surface of a back tooth. A fractured cusp occurs when part of the chewing surface breaks off, often around a filling.
This type rarely damages the dental pulp, the soft inner tissue that holds the tooth's nerves and blood vessels, and usually causes little pain.
Cracked Tooth
A true cracked tooth has a crack that runs from the chewing surface vertically toward the root. The tooth has not separated into pieces, but the crack may gradually spread.
Split Tooth
A split tooth is often the end result of a cracked tooth that has continued to progress. The crack has divided the tooth into segments that can be separated, so the tooth cannot be saved intact.
Vertical Root Fracture
A vertical root fracture begins in the root and extends toward the chewing surface. It often causes few symptoms and may go unnoticed until the surrounding bone and gum become infected.
What Causes Cracked Tooth Syndrome
Cracks often develop from repeated stress over time, although a single injury can also crack a tooth. Recognized contributing factors include:
- Teeth grinding or clenching, known as bruxism
- Habitual biting on hard objects such as ice, unpopped popcorn kernels, or pens
- Uneven biting forces from a poorly aligned bite
- Injuries to the mouth or jaw
Root canal-treated teeth that have posts, or that have lost a lot of root structure, are at the greatest risk of root fractures.
Symptoms and Signs to Watch For
Cracked tooth symptoms are often inconsistent. Common signs include:
- Pain when chewing, sometimes felt as the bite is released
- Sudden sensitivity to cold or to temperature extremes
- Pain that comes and goes rather than staying constant
- Discomfort that is hard to trace to one specific tooth
- Swelling of the gum near the tooth in more advanced cases
Pain on biting is the classic sign, but sensitivity to cold is also common in cracked teeth. Cold sensitivity alone has many causes, including sensitive teeth and cavities.
Why Cracks Are Hard to Detect
A crack is often invisible on a standard X-ray, because fine cracks are frequently too small to appear.
To confirm a crack, the dentist carries out a clinical examination and X-ray, together with specific tests. These may include biting on each cusp in turn, shining a bright light through the tooth (transillumination), and applying a dye that highlights crack lines.
Pulp vitality testing and gentle measurement of the gum around the tooth add further information. Magnification helps reveal fine cracks the naked eye can miss, and some cases also involve cone beam CT (CBCT) imaging.
Why Cracked Tooth Syndrome Should Not Be Left Untreated
Unlike a broken bone, a crack in a tooth does not heal. When a cracked tooth is used for chewing, the pieces can move slightly and irritate the pulp.
Bacteria can also enter the crack and work their way toward the pulp. Over time, this can damage the pulp beyond repair and lead to infection that spreads to the surrounding bone and gum, which can form a dental abscess.
A crack can also keep spreading. Once it extends below the gum line or splits the tooth, the chances of saving the tooth fall sharply. The earlier a cracked tooth is diagnosed and treated, the better the outlook.
If you notice pain when biting or new sensitivity in one area of your mouth, book an appointment at Drs. Nicolas & Asp Centers for an examination rather than waiting for the pain to change.
If you think you have just cracked a tooth, our guide on what to do if you crack your tooth covers the immediate steps. For severe pain or swelling, contact our emergency dental care team the same day.
How Cracked Tooth Syndrome Is Treated
Treatment depends on the type of crack, its location, how deep it extends, and whether the pulp is affected. Your dentist will decide whether to treat the tooth or monitor it.
Monitoring
Craze lines do not need treatment. For other cracks, only a dentist can tell whether the tooth needs treatment or can be monitored at regular visits, based on your symptoms, the location and depth of the crack, and the health of the pulp.
If the appearance of craze lines bothers you, cosmetic dentistry options can be discussed.
Dental Crowns
A dental crown covers the entire visible tooth, holding the cracked walls together and helping protect the crack from spreading. A fractured cusp may be repaired with a new filling or, where more structure is lost, a crown.
When a cracked back tooth is treated, a full-coverage crown is the most commonly recommended restoration. Where less coverage is needed, a partial-coverage restoration such as an onlay may be considered.
A crown offers the strongest protection available, but it cannot guarantee that a crack will never progress.
Root Canal Treatment
If the crack has reached the pulp, root canal treatment removes the damaged or infected pulp. The tooth is then protected with a crown, placed as soon as possible after treatment.
Root canal treatment of cracked teeth is more successful than was once believed, particularly when a crown follows promptly. Your dentist may also adjust the bite so the tooth takes less force until the crown is fitted.
Tooth Extraction
When a crack extends deep below the gum line, or the tooth has split, the tooth often cannot be saved and tooth extraction is recommended.
For back teeth with more than one root, it is sometimes possible to remove only the fractured root and keep the rest of the tooth. Where a tooth is lost, it can be replaced with a dental implant or a dental bridge.
Can Cracked Tooth Syndrome Be Prevented
Cracked teeth cannot be prevented entirely, but you can lower the risk:
- Avoid chewing ice, unpopped popcorn kernels, pens, and other hard objects
- Avoid clenching or grinding your teeth during the day
- Wear a custom night guard if you grind your teeth during sleep
- Wear a mouthguard or protective mask during contact sports
Frequently Asked Questions
No. A crack in a tooth does not heal, even when the pain settles down. Symptoms can ease for long periods, which may make it seem as though the problem has resolved. An examination is the only way to know whether the crack needs treatment or monitoring.
Chewing can make the pieces of a cracked tooth move slightly, which irritates the pulp inside. For some people, this pain is most noticeable as they release their bite rather than when they bite down. Pain on release is one of the signs dentists consider when a crack is suspected.
Often not. Fine cracks are frequently too small to appear on a standard X-ray. Dentists rely on magnification, light, dye, and biting tests to find cracks, and CBCT can show bone changes linked to deeper cracks.
It can. Cracks do not heal, and some continue to spread, which is why early assessment matters. In a U.S. study reported in 2023, very few cracked back teeth developed a fracture over three years, and only a small minority of untreated cracks progressed, with most changes occurring in the first two years. Your dentist will weigh your symptoms and the features of the crack to decide between monitoring and treatment.
Not always. Craze lines usually need no treatment. For other cracks, only a dentist can tell whether a crown is needed, based on your symptoms and the location and depth of the crack. Your dentist will explain whether a crown is actually necessary for your tooth.
Yes. Our teams at Jumeirah, Dubai Marina Walk, The Springs Souk, and Uptown Mirdif diagnose and treat cracked teeth, from monitoring and crowns to root canal treatment. Where a tooth cannot be saved, we also offer extraction and tooth replacement. To arrange a visit, call 04 394 7777.
Start with a general dentist, who can examine the tooth and carry out the tests needed to confirm a crack. If the crack has reached the pulp, a Specialist Endodontist manages root canal treatment, while a Specialist Prosthodontist may plan the crown in more complex cases. Where extraction is needed, an Oral & Maxillofacial Surgeon may be involved.
Coverage depends on your insurance plan and the treatment required. At Drs. Nicolas & Asp Centers, we accept most major insurance cards for direct billing and handle all pre-approvals and paperwork on your behalf.
- Ferracane, Jack L., et al. "Lessons Learned from the Cracked Tooth Registry: A Three-Year Clinical Study in the Nation's Network." Journal of the American Dental Association, vol. 154, no. 3, 2023, pp. 235-244. pmc.ncbi.nlm.nih.gov
- American Association of Endodontists. "Cracked Teeth." American Association of Endodontists, 2025. aae.org
- Krell, Keith V. "Cracked Teeth and Vertical Root Fractures: A New Look at a Growing Problem." Endodontics: Colleagues for Excellence, American Association of Endodontists, 2022. aae.org
