What your dentist does for a cracked tooth depends entirely on how deep the crack goes. A shallow crack confined to the outer enamel might need nothing more than smoothing or a bit of bonding material, while a crack that reaches the nerve inside the tooth could require a root canal, a crown, or in the worst cases, extraction. The first step is always figuring out exactly what type of crack you’re dealing with.
How the Dentist Finds the Crack
Cracked teeth are notoriously difficult to diagnose. Only about 46% of cracked teeth cause noticeable symptoms, which means many cracks are discovered during routine exams rather than emergency visits. When you do have symptoms, the most common ones are pain when biting down (and especially when releasing the bite), sensitivity to cold or sweet foods, and sometimes headaches.
Your dentist will likely start with a bite test, asking you to bite down on something small like a cotton roll or a specially designed stick, one cusp at a time, to isolate where the pain is coming from. This is the most widely used method in everyday practice, though it can’t confirm a crack on its own. The next tool is transillumination, where the dentist shines a bright light through the tooth. A crack will block the light and create a visible line. This technique has the highest accuracy of common diagnostic methods, correctly identifying cracks about 65% of the time. Your dentist may also use a dental microscope to get a magnified view of the tooth surface, and in some cases, a 3D cone-beam CT scan can reveal cracks that extend below the gumline into the root, which standard X-rays often miss entirely.
Five Types of Cracks, Five Different Paths
Dentists classify cracked teeth 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 that sit entirely within the enamel. They show up as faint vertical lines on the surface, cause zero pain, and need no treatment. Nearly every adult has them.
Fractured cusps happen when one of the raised points on a back tooth breaks away, often around a large filling. The crack typically runs along the side of the tooth and stops near the gumline. Because the break rarely reaches the nerve, it usually causes little pain beyond some sensitivity.
Cracked teeth (the clinical term for an incomplete vertical crack) run from the chewing surface downward toward the root but haven’t split the tooth into separate pieces yet. These are the tricky ones: symptoms are highly variable, and the crack can be hard to detect. Left untreated, this type tends to get worse over time.
Split teeth are what happens when a cracked tooth progresses to a complete fracture, separating the tooth into distinct segments. When the split is obvious, diagnosis is straightforward, but the treatment options narrow significantly.
Vertical root fractures start in the root and work upward. They often develop in teeth that have already had root canal treatment. These fractures create a narrow pocket of infection along the root and sometimes a small pimple-like bump on the gum nearby.
Bonding for Minor Cracks
For small chips and surface-level cracks, dental bonding is the simplest fix. Your dentist applies a tooth-colored resin directly to the crack, shapes it to match your natural tooth, and hardens it with a curing light. The whole process typically takes one appointment and costs between $100 and $600. Bonding works well for visible front teeth where cosmetic appearance matters, and it lasts roughly 5 to 10 years before it may need to be touched up or replaced. It’s not the right choice for cracks under heavy biting pressure, though, because the resin isn’t strong enough to hold a back tooth together on its own.
Crowns for Deeper Fractures
When a crack is more extensive, particularly a fractured cusp or a crack that hasn’t yet reached the nerve, a crown is the standard treatment. A crown is a cap that fits over the entire visible portion of the tooth, holding it together and protecting it from further damage. Your dentist reshapes the remaining tooth structure, takes an impression or digital scan, and places either a temporary crown while the permanent one is made in a lab or, in some offices, mills a crown the same day.
Crowns cost between $900 and $3,500 depending on material and location, and they typically last 15 to 20 years. The data strongly supports this approach: cracked teeth restored with a full crown after treatment have a 97% survival rate, compared to a much lower 68% five-year survival rate for cracked teeth overall. That difference is significant enough that most dentists will recommend a crown over a filling for any crack that extends beyond the enamel surface.
When a Root Canal Comes First
If the crack has reached the pulp, the soft tissue inside the tooth that contains nerves and blood vessels, you’ll feel it. Sharp, lingering pain with temperature changes and spontaneous aching are signs the nerve is inflamed or infected. In these cases, your dentist or an endodontist (a root canal specialist) will need to remove the damaged pulp before placing a crown.
During a root canal, the inside of the tooth is cleaned out, disinfected, and filled with a sealing material. Then a crown goes on top to protect the now-hollowed tooth. The combined cost of root canal plus crown typically runs between $1,500 and $6,000. The root canal itself is a permanent treatment, and the crown on top should last 15 to 20 years.
Not every cracked tooth qualifies for a root canal, though. The American Association of Endodontists recommends that the crack should not extend across the floor of the pulp chamber, and the tooth should show no signs of being completely split. If those conditions aren’t met, the long-term prognosis drops considerably, and extraction becomes the more predictable option.
When the Tooth Can’t Be Saved
Split teeth and vertical root fractures are the two scenarios where extraction is most likely. A split tooth has already separated into pieces, and once that happens, it generally can’t be reliably held together. Vertical root fractures in single-rooted teeth are almost always extracted because the crack undermines the entire foundation of the tooth. In multi-rooted teeth like molars, it’s sometimes possible to remove just the affected root and keep the rest, but this depends on the specific anatomy.
After extraction, replacing the missing tooth with a dental implant is the most durable long-term solution, but the process takes months. It involves placing a titanium post in the jawbone, waiting for it to integrate with the bone (usually 3 to 6 months), and then attaching a crown on top. Other replacement options include a dental bridge or a removable partial denture.
Protecting a Cracked Tooth Going Forward
If you grind or clench your teeth, especially at night, you’re putting repaired teeth at risk. Clenching generates enormous force on the back teeth, and dentists have seen a noticeable increase in cracked, chipped, and worn teeth in recent years linked to stress-related grinding. A custom-fitted occlusal guard (night guard) creates a barrier between your upper and lower teeth, absorbing and distributing that force. Your dentist takes an impression of your teeth, the guard is fabricated in a lab, and it’s then adjusted over time to make sure it fits comfortably and evenly. This is one of the simplest ways to protect both natural teeth and dental work from future cracks.
Avoiding chewing on hard objects like ice, unpopped popcorn kernels, and pen caps also reduces your risk. If you already have a crack that’s been treated with bonding or a crown, keeping up with regular dental visits allows your dentist to monitor the repair and catch any progression before it becomes a bigger problem.