How a cracked tooth gets fixed depends entirely on how deep the crack goes. A shallow surface crack might need nothing more than a cosmetic resin, while a crack that reaches the nerve inside your tooth could require a root canal and crown. In the worst cases, the tooth can’t be saved at all. The good news: most cracked teeth are treatable if you act before the damage spreads.
Why Cracked Teeth Hurt the Way They Do
If you’ve noticed a sharp, sudden pain when you bite down on something, followed by a second jolt of pain when you release the bite, that pattern is the hallmark of a cracked tooth. It happens because the cracked piece of tooth flexes slightly under pressure, then snaps back into place when you stop biting. That movement pulls on fluid inside microscopic tubes in your tooth, triggering the nerve. This is why the pain often feels inconsistent: it only fires when the crack moves, so soft foods might not bother you at all while a piece of crusty bread sets it off.
Over time, the repeated flexing irritates the pulp (the living tissue inside the tooth) to the point where it can’t repair itself. That’s when you start getting sensitivity to hot and cold drinks, or a dull ache that shows up on its own without chewing. These are signs the crack is progressing inward, and treatment becomes more involved the longer you wait.
The Five Types of Tooth Cracks
The American Association of Endodontists classifies cracks into five categories, and your treatment path follows directly from which type you have.
- Craze lines: Tiny, shallow cracks in the outer enamel only. Nearly every adult has them. They don’t hurt and rarely need treatment.
- Fractured cusp: A piece of the chewing surface breaks off, usually around a filling. The crack typically stays above the gum line and doesn’t reach the nerve.
- Cracked tooth: A crack runs vertically from the chewing surface toward the root. The tooth is still in one piece, but the crack can gradually spread deeper.
- Split tooth: A cracked tooth that has progressed until the tooth separates into distinct segments. This is often the end result of ignoring a cracked tooth for too long.
- Vertical root fracture: The crack starts in the root and moves upward. These are tricky because they can go unnoticed for a while, sometimes only showing signs when the surrounding bone and gum become infected.
Fixes for Minor Cracks
Craze lines and small chips are the simplest to address. Your dentist applies a tooth-colored resin directly to the crack, sculpts it to match the shape of your tooth, and hardens it with a curing light. The whole process, called dental bonding, usually takes one visit and doesn’t require numbing. Bonding works well for small cosmetic defects: chips, hairline cracks, or minor gaps. It won’t hold up under heavy biting forces the way a crown will, but for a front tooth with a surface-level crack, it’s often the right call.
If the crack is on a visible front tooth and you want a longer-lasting cosmetic fix, a veneer (a thin porcelain shell bonded to the front of the tooth) is another option. Veneers are more durable than bonding but cost more and require removing a thin layer of enamel.
Crowns for Deeper Cracks
When a crack is too large for bonding or involves a piece of the chewing surface breaking away, a dental crown is the standard fix. A crown is a custom-fitted cap that covers the entire visible portion of the tooth, holding the cracked pieces together and protecting them from further splitting. Crowns are typically recommended for significant fractures, extensive wear, or teeth that have already had root canal treatment.
Getting a crown usually takes two appointments. At the first visit, the dentist reshapes the tooth to make room for the crown and takes impressions or digital scans. You leave with a temporary crown. A few weeks later, the permanent crown (porcelain, ceramic, or metal) is cemented in place. Modern crowns look and feel like natural teeth, and they restore full chewing function.
When a Root Canal Is Needed
If the crack has extended into the pulp, the nerve and blood supply inside the tooth, a crown alone won’t solve the problem. The damaged pulp needs to be removed first through a root canal, and then a crown is placed over the tooth to prevent the crack from spreading further.
You’ll likely know the crack has reached this point because the symptoms escalate. Instead of pain only when chewing, you’ll feel sensitivity to temperature extremes and eventually a persistent ache even when you’re not eating. Left untreated, bacteria can enter the pulp through the crack and cause an infection that spreads to the surrounding bone and gum tissue.
The outcomes for this approach are encouraging. A 2025 study tracking cracked teeth that received root canals found a 99.2% survival rate at two years and a 78.6% survival rate at five years. Those numbers mean the large majority of cracked teeth that get timely treatment remain functional for years afterward.
Cracks That Can’t Be Saved
Two types of cracks generally mean the tooth is beyond repair. A split tooth, where the crack has divided the tooth into separate segments, can sometimes be partially saved if one segment and its root are still intact. More often, though, the tooth needs to come out. A vertical root fracture, which starts deep in the root, almost always requires extraction because the crack is inaccessible to repair.
If you do lose a tooth, a dental implant is the most common long-term replacement. The full process, from extraction to a finished replacement tooth, typically spans five to nine months. After the tooth is removed, the jawbone needs two to six months to heal and rebuild where the socket was. Then a titanium post is placed into the bone, and another two to six months pass while the bone fuses around it. Finally, a custom crown is attached to the post. The lower jaw tends to heal faster (two to four months for fusion) than the upper jaw (four to six months). It’s a long timeline, but the result is a permanent replacement that functions like a natural tooth.
Signs of Infection to Watch For
A cracked tooth that goes untreated can develop a pulp infection, and from there the bacteria can spread into the bone and gums. Warning signs include swelling around the tooth or in your face, fever, increased pain that doesn’t respond to over-the-counter painkillers, tender or swollen glands in your neck, and persistent bad breath. These symptoms mean the infection is active and needs prompt treatment, as it will not resolve on its own.
Preventing Cracks From Getting Worse
If you grind or clench your teeth at night, a custom night guard is one of the most effective ways to protect against new cracks and stop existing craze lines from deepening. Night guards are made from durable acrylic or thermoplastic material that absorbs and distributes the force of grinding across the entire guard rather than concentrating it on individual teeth. Without one, chronic grinding can flatten, crack, or chip teeth over time.
Beyond a night guard, a few habits make a real difference. Avoid chewing ice, hard candy, and unpopped popcorn kernels. If you play contact sports, wear a mouthguard. And if you already have a crack that only hurts occasionally, don’t assume it’s fine because the pain comes and goes. Cracks don’t heal on their own. They only get deeper.