When you visit a dentist with a cracked tooth, they’ll first figure out exactly how deep and extensive the crack is, then choose a treatment that matches. That could range from doing nothing at all for a superficial crack to extracting the tooth if the damage reaches the root. What happens in your appointment depends almost entirely on the type of crack you have.
How the Dentist Finds the Crack
Cracks in teeth are surprisingly hard to see. They rarely show up on standard X-rays because most cracks run in a direction that’s parallel to the X-ray film, making them essentially invisible. Your dentist will use several hands-on techniques instead, often combining more than one to confirm a diagnosis.
The most telling test is a bite test. You’ll be asked to bite down on a cotton roll, a small wooden stick, or a specialized tool that isolates pressure on one cusp at a time. Pain when you bite down, or especially when you release the bite, points directly to a cracked cusp. Your dentist may also shine a bright fiber-optic light through the tooth. A crack in the hard inner layer of the tooth disrupts the way light passes through, making the fracture line visible even when it can’t be seen with the naked eye.
Other diagnostic steps include running a sharp explorer across the tooth surface to feel for a crack line, applying a colored dye that seeps into fractures to highlight them, and probing the gums around the tooth. An isolated deep pocket in the gum tissue around one tooth often signals that a crack extends below the gumline. In some cases, the dentist may need to remove an existing filling to see the fracture lines underneath.
For cracks suspected deep in the root, 3D imaging (CBCT scans) can help, though even this technology has limits. Very narrow fractures, especially those thinner than 75 micrometers, fall below the scanner’s resolution. Fillings inside the root canal can also create false images that mimic fracture lines.
Five Types of Cracks and What Each Means
The American Association of Endodontists classifies tooth fractures into five categories, and each one calls for a different response.
Craze lines are the most common and least serious. These are tiny, shallow cracks in the outer enamel only. They cause no pain, pose no threat to the tooth’s health, and require no treatment. If they bother you cosmetically, your dentist may offer teeth whitening or bonding, but that’s purely optional.
Fractured cusps occur when one of the pointed chewing surfaces of a tooth breaks away, often around an existing filling. You’ll typically feel sharp pain when chewing or sensitivity to cold. The fix is straightforward: your dentist removes the damaged cusp and restores the tooth with a crown or large filling. The prognosis is very good.
Cracked teeth have a fracture that runs from the chewing surface down toward the root but hasn’t yet split the tooth into separate pieces. Symptoms vary widely. Some people feel intermittent pain when chewing; others notice sensitivity to hot or cold that comes and goes unpredictably. Treatment depends on how deep the crack goes and whether it has reached the nerve inside the tooth.
Split teeth are what happens when a crack progresses until the tooth separates into distinct segments. At this point, the tooth can’t be saved intact. Your dentist may be able to remove one segment and restore what’s left, but in many cases the tooth needs to be extracted.
Vertical root fractures start in the root and work upward. They often produce minimal symptoms at first, showing up as a slow-developing infection or an isolated deep gum pocket. These fractures almost always require extraction, particularly in single-rooted teeth.
When a Crown Is Enough
For fractured cusps and cracks that stay within the visible portion of the tooth above the gumline, a dental crown is the standard treatment. The crown wraps around the entire tooth, holding the cracked pieces together and preventing the fracture from spreading deeper. Your dentist will reshape the tooth, take impressions, and place a temporary crown while the permanent one is made. The whole process typically takes two visits spread over a couple of weeks.
Modern crowns are often made from zirconia, a ceramic material with excellent strength and a natural appearance. Porcelain and porcelain-fused-to-metal crowns are also options, depending on the tooth’s location and how much force it handles during chewing.
When a Root Canal Becomes Necessary
If the crack extends deep enough to reach the pulp, the soft tissue inside the tooth containing nerves and blood vessels, you’ll likely need a root canal before the crown is placed. The nerve tissue becomes inflamed or infected once exposed to bacteria through the crack line, causing persistent pain and sensitivity.
During a root canal, the dentist or endodontist removes the damaged pulp, cleans and shapes the inside of the tooth, and seals it. A crown is then placed over the treated tooth. This last step is critical. One study found that cracked teeth treated with a root canal but not given a crown had only a 20% survival rate at two years. Those that received a crown after the root canal had a 94% survival rate over the same period.
Timing matters too. Delaying crown placement after root canal treatment creates a significant risk of the crack spreading further or the tooth splitting entirely. Your dentist will typically want to get the crown on as quickly as possible.
When Extraction Is the Only Option
Some cracks can’t be saved. A tooth generally needs to be pulled when the crack extends across the floor of the pulp chamber (the area where the root canals branch off), when the tooth has split into fully separate segments, or when a vertical root fracture runs along the root itself.
Vertical root fractures are particularly tricky because they often go undetected for months, quietly causing bone loss around the root. Signs include a narrow, deep gum pocket on one side of the tooth, recurring abscesses near the root, and a characteristic “halo” of bone loss visible on X-rays. Extracting the tooth early, before significant bone loss occurs, preserves enough jaw bone to support a dental implant later.
After extraction, your dentist will discuss replacement options. These typically include a dental implant, a fixed bridge, or a removable partial denture.
What Recovery Looks Like
Recovery time varies considerably depending on the treatment. A crown placed over a fractured cusp with no root canal involvement may feel normal within days. A root canal with a crown can take a few weeks before sensitivity fully resolves. Extractions followed by implant placement involve a longer timeline, often several months to allow for bone healing before the final restoration is placed.
Regardless of treatment, you can reduce the risk of cracking another tooth by avoiding chewing ice, hard candies, and other hard objects. If you grind your teeth at night, a custom night guard helps protect your remaining teeth from the same kind of damage. Teeth with large existing fillings are especially vulnerable to fractures, so your dentist may recommend placing crowns on heavily restored teeth before they crack.