How a cracked tooth gets fixed depends entirely on how deep the crack goes. A shallow crack limited to the outer enamel needs no treatment at all, while a crack that reaches the nerve or splits the tooth in two may require a root canal or extraction. Most cracked teeth fall somewhere in between and can be saved with bonding, a crown, or a combination of both.
Not All Cracks Are the Same
Dentists classify tooth cracks into five categories, and the type you have determines what “fixing” actually looks like.
- Craze lines are the tiny, hairline cracks visible on the surface of most adult teeth. They only affect the enamel, cause no pain, and don’t need treatment. Nearly every adult has them.
- Fractured cusp happens when a piece of the chewing surface breaks off, usually around an existing filling. The crack rarely reaches the nerve, so it’s typically painless and fixable with a crown.
- Cracked tooth is a crack running from the chewing surface down toward the root, but the tooth is still in one piece. This is the most common type people search about. It often causes sharp pain when biting and sensitivity to hot, cold, or sweet foods.
- Split tooth is what happens when a cracked tooth goes untreated long enough for the crack to travel all the way through, separating the tooth into two distinct segments. Part or all of the tooth usually needs to come out.
- Vertical root fracture starts in the root and works upward. These cracks are hard to detect and often only discovered when the surrounding bone or gum becomes infected. Extraction is the most common outcome.
Why a Cracked Tooth Hurts
The outer enamel of your tooth has no nerve endings, but beneath it sits a layer of softer tissue called dentin, and at the center is the pulp, which contains the nerve and blood supply. When a crack extends past the enamel, it creates a pathway for bacteria to reach the pulp. That triggers inflammation, which is why you feel a jolt of pain when you bite down or drink something cold.
If bacteria reach the pulp and the inflammation goes unchecked, the nerve can die. At that point you might actually stop feeling temperature sensitivity, which can seem like improvement. It isn’t. A dead nerve can lead to an abscess, a pocket of pus at the root tip that causes deep, throbbing pain and facial swelling. Left untreated, the infection can spread to your jaw or beyond.
How Dentists Find the Crack
Cracks don’t always show up on X-rays, so dentists use a few hands-on techniques. They may have you bite down on a small stick or rubber instrument, tooth by tooth, to pinpoint which one triggers pain. They’ll shine a bright light through the tooth (transillumination), since light stops at a crack line. A staining dye painted onto the tooth can also make an invisible crack visible. Together, these methods help determine how far the crack extends and whether the nerve is involved.
Treatment Options by Severity
Dental Bonding
For minor cracks that haven’t reached the nerve, your dentist can apply a tooth-colored composite resin directly to the crack. The resin is shaped to match your tooth, then hardened with a curing light. The whole process takes one visit, and bonding typically costs $250 to $600 per tooth. More complex cases can run up to $1,000. Bonding works well for front teeth and small cracks, but it’s not as durable as a crown on a molar that takes heavy chewing force.
Dental Crown
A crown is the standard fix for a cracked back tooth that’s still in one piece. It caps the entire visible portion of the tooth, holding the cracked segments together and protecting the nerve from further exposure. Crowns cost between $700 and $3,500 per tooth depending on the material. The process usually takes two appointments: one to prepare the tooth and fit a temporary crown, and a second to place the permanent one. Some offices with in-house milling equipment can do it in a single visit.
After a crown is placed, expect some sensitivity and mild discomfort for a few days. For most people this fades within one to two weeks. If pain persists beyond several weeks or gets worse, that’s a sign the crack may be deeper than initially assessed, and you should go back for evaluation. Crowns are still susceptible to decay along the gum line, so brushing with fluoride toothpaste and flossing daily remain essential.
Root Canal Plus Crown
When the crack has reached the pulp, the nerve tissue needs to be removed before a crown can be placed. This is a root canal. Your dentist or an endodontist cleans out the infected pulp, fills the interior of the tooth, and then covers it with a crown for structural support. A study of 263 cracked posterior teeth treated with root canals found an overall survival rate of about 90% over an average follow-up of roughly three and a half years. The five-year survival rate was around 79%. Teeth where the crack hadn’t extended deep into the root had the best outcomes, with success rates as high as 98%. Teeth with deep cracks and significant gum pocket involvement fared much worse, with success rates dropping to about 33%.
Extraction
Some cracks can’t be repaired. A tooth that has fully split into two pieces, a vertical root fracture, or a crack that extends well below the gum line into the root generally can’t support a crown. In these cases, the tooth is extracted and replaced with an implant, bridge, or removable partial denture. Your dentist will walk you through replacement options based on the tooth’s location and your budget.
Choosing a Crown Material
If you need a crown, the material matters, especially for molars. Zirconia crowns have become the go-to for back teeth because of their exceptional strength. Lab testing shows zirconia can withstand fracture forces well above what your jaw generates during normal chewing, and the way the dentist shapes the tooth before placing the crown significantly affects how strong the final result is. Porcelain crowns look very natural and work well on front teeth, but they’re more prone to chipping on molars. Metal and porcelain-fused-to-metal crowns are also options, though they’re less popular now that zirconia offers both strength and a tooth-like appearance.
What to Do Before You Get to the Dentist
If you’ve just cracked a tooth, rinse your mouth with warm water and save any broken pieces. If there’s bleeding, press a piece of gauze against the area for about 10 minutes. A cold compress held against your cheek near the cracked tooth helps with pain and swelling. Over-the-counter pain relievers can bridge the gap until your appointment.
Avoid chewing on that side of your mouth. Skip very hot or cold drinks, and don’t eat anything hard or sticky. These steps won’t fix anything, but they prevent the crack from worsening and keep your pain manageable.
Get to a dentist quickly. A crack that could be saved with a crown today can become a split tooth or abscess next month. If you develop facial swelling, fever, or bleeding that won’t stop, treat it as an emergency and seek care immediately.
Why Teeth Crack in the First Place
Teeth crack for a handful of common reasons: biting down on something hard (ice, popcorn kernels, hard candy), grinding or clenching your teeth at night, large existing fillings that weaken the remaining tooth structure, or sudden temperature changes in the mouth. Age plays a role too. Cracks become more common after 50 as enamel wears thinner over a lifetime of use.
If grinding is the cause, a custom night guard from your dentist can protect your teeth from future cracks. If you’ve already had one cracked tooth, the conditions that caused it likely apply to your other teeth as well, making prevention worth the investment.