How a cracked tooth gets fixed depends entirely on how deep the crack goes. A shallow surface crack might need nothing more than a coat of composite resin, while a crack that reaches the root may require extraction. Most cracked teeth fall somewhere in between, and the good news is that the majority can be saved with the right treatment at the right time.
Not All Cracks Are the Same
Dentists categorize tooth cracks into five types, ranging from harmless to non-restorable. Understanding which type you have is the first step toward knowing what fix you’ll need.
Craze lines are the tiny, hairline cracks visible on the surface of your enamel. Nearly every adult has them. They’re purely cosmetic and don’t cause pain or threaten the tooth’s structure.
Fractured cusps happen when a piece of the tooth’s chewing surface breaks off, usually around a filling. These rarely affect the inner nerve of the tooth and are straightforward to repair.
Cracked teeth have a crack that runs vertically from the chewing surface down toward the root. If the crack hasn’t yet reached the inner pulp (the nerve and blood supply), the tooth can usually be saved. If it has, more involved treatment is needed.
Split teeth are cracked teeth that have progressed into two distinct segments. By this point, saving the entire tooth is rarely possible, though a portion can sometimes be preserved.
Vertical root fractures start at the root and extend upward. These are the hardest to detect and carry the poorest outlook. Extraction is the most common outcome, especially in molars, where the complex root structure and heavy chewing forces make repair impractical.
How Your Dentist Finds the Crack
Cracks are notoriously difficult to see, even on X-rays. Your dentist will likely use several tools to locate and assess the damage. The most informative is transillumination: shining a bright light through the tooth. Light travels through solid tooth structure but stops at a crack, creating a visible dark line at the fracture. This can be done with a fiberoptic handpiece or even a composite curing light.
Other methods include a bite test (you bite down on a small stick or cushion, and pain when you release pressure is a classic sign of a crack), dye staining with methylene blue to highlight fracture lines, periodontal probing to check for isolated deep pockets near the crack, and magnification with dental loupes or a microscope. For deeper cracks, a cone-beam CT scan can reveal fractures that extend below the gumline, particularly those hidden between roots where a standard probe can’t reach.
Fixes for Minor Cracks
If you’re dealing with craze lines or a small chip, the repair is quick and minimally invasive.
Dental bonding involves applying a tooth-colored composite resin directly onto the crack. Your dentist sculpts the resin to match your tooth’s shape, then hardens it with a curing light. The whole process takes one visit, requires no anesthesia in most cases, and costs between $100 and $600 per tooth. Bonding works well for craze lines and minor surface cracks where the tooth’s structure is still sound. It’s primarily a cosmetic fix, sealing the crack from bacteria while restoring a smooth appearance.
Crowns for Moderate Cracks
When a crack goes deeper than the enamel surface, or when a cusp has broken off, a dental crown is the standard repair. A crown is a cap that fits over the entire visible portion of the tooth, holding the cracked pieces together and restoring the tooth’s ability to handle chewing forces.
Getting a crown typically takes two visits. At the first, your dentist reshapes the tooth and takes impressions (or a digital scan) to create a custom-fitted cap. You’ll wear a temporary crown for one to two weeks while the permanent one is made. At the second visit, the permanent crown is cemented in place. Some offices with in-house milling technology can do this in a single appointment.
Crown materials include porcelain, ceramic, metal alloy, or a combination. The choice depends on the tooth’s location and how much biting force it needs to withstand. Crowns run between $800 and $3,500 per tooth depending on the material and complexity of the case.
When a Root Canal Is Needed
A crack that reaches the pulp, the soft tissue inside the tooth containing nerves and blood vessels, changes the equation. Bacteria follow the crack inward, inflaming or infecting the pulp. At this point, you’ll likely notice sharp pain when biting, lingering sensitivity to hot or cold, or a dull ache that comes and goes.
A root canal removes the infected pulp, cleans and disinfects the interior of the tooth, and seals it. A crown is placed on top afterward for structural protection. The combined cost of a root canal and crown ranges from $1,500 to $6,000.
Not every deeply cracked tooth is a candidate for a root canal. To have a good outcome, the crack should not extend across the floor of the pulp chamber or run down along multiple root surfaces. Your dentist or endodontist will assess this with magnification, sometimes checking the internal extent of the crack under a microscope before committing to treatment. If the crack has already separated the tooth into distinct pieces (a split tooth), a root canal won’t hold things together.
When the Tooth Can’t Be Saved
Vertical root fractures and fully split teeth generally require extraction. A vertical root fracture runs along the length of the root itself, and in molars, where chewing forces are highest and root anatomy is complex, this is considered essentially incurable. When fractures involve multiple root surfaces, the mechanical stability of the root is too compromised for repair.
After extraction, you’ll discuss replacement options with your dentist. A dental implant, bridge, or partial denture can fill the gap and restore function. The choice depends on the tooth’s location, your bone health, and your budget.
What Happens If You Wait
Cracks don’t heal on their own. They tend to extend over time, driven deeper by the repeated stress of chewing. A crack that starts in the crown of the tooth can gradually work its way into the root, turning a treatable problem into an extraction.
The more immediate risk is infection. Bacteria can seep through any opening in a tooth and reach the pulp, causing inflammation that can progress to an abscess, a pocket of infection at the root tip. An untreated abscess can spread to the jawbone, the soft tissues of your face and neck, and in rare but serious cases, to the heart or brain. What starts as an occasional twinge when you bite down can become a dental emergency if left alone long enough.
Recovery After Repair
Recovery varies by procedure but is generally straightforward. After bonding, there’s virtually no downtime. You can eat normally once any numbness wears off, though you’ll want to avoid biting directly on hard objects with the bonded tooth.
After a crown or root canal, expect some sensitivity to hot and cold temperatures for a few days. For the first 24 to 48 hours, stick to soft foods and avoid anything hard, crunchy, or sticky that could damage the treated area or dislodge a temporary crown. Most people return to their normal diet within a week as comfort improves. The treated tooth may feel slightly different when you bite down at first, but this usually resolves as the surrounding tissues settle.
Long-term, a crowned tooth or root canal-treated tooth can last many years with normal oral hygiene. The key is protecting it from the same forces that caused the crack in the first place. If you grind your teeth at night, a custom night guard is worth the investment. If the crack happened while chewing ice or hard candy, that habit needs to go.