Dentists treat a cracked tooth based on how deep and extensive the crack is, with options ranging from simple bonding for minor cracks to extraction for teeth that can’t be saved. Most cracked teeth fall somewhere in the middle and are treated with a crown, a root canal, or both. The first step is always figuring out exactly what type of crack you’re dealing with, because that determines everything else.
How Dentists Find and Evaluate the Crack
Cracks in teeth can be surprisingly hard to see, even on standard X-rays. Your dentist will likely use several techniques to pin down the location and severity. A bite test, where you chomp down on a small stick or rubber tool, helps identify exactly which tooth hurts and where the crack runs. If biting down in a specific spot reproduces your pain, that’s a strong signal.
Transillumination, where the dentist shines a bright light through your tooth, is one of the more reliable methods. Light stops at a fracture line, making the crack visible. A staining dye can also be painted onto the tooth surface to highlight hairline cracks that would otherwise be invisible. Your dentist will check your gums for inflammation, since vertical fractures often irritate the surrounding tissue, and may use a periodontal probe (a thin instrument that measures the space between your tooth and gum) to detect bone loss along the fracture line.
Standard dental X-rays sometimes miss cracks entirely, so your dentist may order a cone beam CT scan, which is a 3D image that can reveal bone loss patterns associated with fractures. This type of scan is particularly useful for detecting cracks that run vertically down the root, which are the hardest to diagnose and carry the worst prognosis.
The Five Types of Tooth Cracks
The American Association of Endodontists classifies tooth fractures into five categories, and knowing which one you have is the single biggest factor in your treatment plan.
- Craze lines are tiny, superficial cracks in the outer enamel. Almost every adult has them. They don’t hurt and don’t need treatment.
- Fractured cusp means a piece of the chewing surface has broken off. This rarely damages the inner nerve and is usually fixed with a crown.
- Cracked tooth is a crack that runs vertically from the chewing surface toward the root but hasn’t yet split the tooth in two. This is the most common type people search about, and it has the widest range of outcomes depending on depth.
- Split tooth means the crack has gone all the way through, separating the tooth into distinct segments. A split tooth generally can’t be saved intact, though sometimes part of it can be preserved.
- Vertical root fracture starts in the root and extends upward. These often develop in teeth that have already had root canals, and extraction is the most common outcome.
Bonding for Minor Cracks
If the crack is small and mostly cosmetic, a chip or a shallow fracture that hasn’t reached the inner layers of the tooth, your dentist may use composite resin bonding. This is a tooth-colored material molded directly onto the damaged area. The whole process typically takes a single visit, and the result blends in with your natural tooth color.
Bonding works well for small chips and minor surface fractures, but it has limits. The material isn’t as strong as a crown and can chip or stain over time, especially on teeth that take heavy biting forces like molars. Think of bonding as a patch rather than a permanent structural repair.
Crowns for More Significant Fractures
A dental crown is the most common treatment for a cracked tooth that’s still structurally intact but too damaged for bonding alone. The crown fits over the entire visible portion of the tooth, holding everything together and preventing the crack from spreading further. Crowns are significantly more durable than bonding and can handle the full force of chewing.
Getting a crown usually takes two visits. At the first appointment, the dentist reshapes the tooth to make room for the crown and takes impressions or digital scans. You’ll leave with a temporary crown while the permanent one is fabricated, then return a couple of weeks later for placement. Some offices have same-day milling technology that can cut this down to a single visit.
Cost varies widely depending on the material. All-porcelain crowns typically run $800 to $3,000 per tooth, porcelain fused to metal costs $500 to $1,500, and gold crowns range from $600 to $2,500. The average for a standard crown lands between $1,100 and $1,500. Dental insurance often covers a portion if the crown is deemed medically necessary rather than cosmetic.
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 a crown can be placed. The signs that a crack has reached the pulp include lingering sensitivity to hot or cold (not just a quick zing, but pain that sticks around), spontaneous throbbing pain, and swelling near the affected tooth.
During a root canal, the damaged pulp is removed, the interior of the tooth is cleaned and sealed, and then a crown is placed on top for protection. Adding a root canal to the process can roughly double the total cost of treatment. The good news is that cracked teeth treated this way have reasonable long-term survival. A study published in the Journal of Endodontics tracking patients over more than a decade found a 66% survival rate at 10 years and 55% at 15 years. Teeth that had no significant gum pocket depth before treatment fared better: 76% survived at 10 years and 64% at 15 years.
Those numbers might sound lower than you’d expect, but they reflect the reality that cracked teeth are inherently compromised. A tooth that survives 10 or 15 years after treatment has given you a lot of additional use, and many last even longer.
When the Tooth Can’t Be Saved
Some cracks are too extensive for any restorative treatment. A tooth that has fully split into separate pieces, or one with a vertical root fracture running along the length of the root, typically needs to be extracted. Vertical root fractures carry a particularly poor prognosis. They’re defined as longitudinal cracks extending along the root’s long axis, and they most commonly occur in teeth that have already had root canals, where the remaining tooth structure is thinner and more brittle.
Your dentist will consider extraction when the crack extends across the floor of the pulp chamber, when the tooth has split completely, or when the fracture involves multiple root surfaces. After extraction, the most common replacement options are a dental implant or a bridge. Your dentist will discuss timing and options, since some people need bone to heal for several months before an implant can be placed.
Protecting the Tooth After Treatment
Fixing a cracked tooth is only half the equation. If the forces that caused the crack in the first place aren’t addressed, you risk damaging the repaired tooth or cracking another one. Grinding and clenching (often during sleep, when you can’t control it) are among the most common culprits.
A custom occlusal guard, sometimes called a night guard, acts as a barrier between your upper and lower teeth. It’s made from hard acrylic or nylon, fabricated from impressions or scans of your teeth, and adjusted over time for a comfortable fit. Wearing one consistently protects not just the treated tooth but all of your teeth from the excessive forces that lead to cracks, chips, and wear.
Beyond a night guard, practical steps include avoiding chewing ice and hard candy, not using your teeth as tools to open packaging, and being mindful of very hard foods like unpopped popcorn kernels and bone-in meats. If you play contact sports, a properly fitted mouthguard is worth the investment.