Last updated: September 2026
You bite down on something and feel a sharp jab of pain. Or maybe there is no dramatic moment at all, just a tooth that has been giving you trouble for weeks, hurting when you chew on one side and fine the rest of the time. Both patterns point toward the same thing: a cracked tooth.
Cracked teeth are common, frustrating to diagnose, and range from harmless to urgent. The type of crack determines the treatment, and acting early almost always means a simpler, less costly outcome.
Not all cracks are equal. The clinical terminology matters because it determines what can be done.
These are the fine, shallow lines you can see on the enamel of most adult teeth, particularly under bright light. They are superficial, do not extend into the dentine underneath, and do not cause symptoms. Nearly every adult has them. They require no treatment.
A piece of the chewing surface breaks off, usually around a large filling. The break stays above the gum line and typically does not involve the nerve. It hurts when it happens, but the underlying tooth can usually be saved with a crown. This is one of the most common types of crack we see, particularly in teeth with old amalgam fillings that have been in place for twenty or thirty years.
A crack runs vertically from the chewing surface down toward the root, but the tooth has not yet separated into two pieces. This is the classic "hurts when I bite" crack. The crack can propagate over time, and if it reaches the nerve, the tooth will need a root canal. If it reaches below the gum line into the root, the tooth may not be saveable.
Early detection and treatment, usually a crown to hold the tooth together, gives the tooth its best chance. Waiting until the crack reaches the nerve or splits the tooth converts a straightforward crown into a root canal plus crown, or an extraction.
The tooth has cracked completely into two or more separate segments. At this point, the tooth usually cannot be saved. Extraction is the likely outcome. If the split extends below the bone level, there is no way to seal the gap or hold the pieces together predictably.
A crack that starts in the root and extends upward. These are often found in teeth that have had root canals, because the root-treated tooth is more brittle. Vertical root fractures are difficult to diagnose because the symptoms (gum swelling, a sinus tract, vague discomfort) can mimic other conditions. The prognosis is usually poor, and extraction is commonly needed.
Understanding the causes helps you protect the teeth you still have:
If the crack is a craze line with no symptoms and no structural risk, the treatment is nothing. Your dentist notes it and checks it at your regular examinations.
For small chips and minor fractures of a cusp, composite bonding can restore the tooth's shape and protect the exposed surface. This is a conservative, single-visit treatment, but it is only appropriate for small defects. It does not hold a cracked tooth together the way a crown does.
For fractured cusps and incomplete cracks, a crown is usually the treatment of choice. It wraps around the entire tooth, holding the remaining structure together and preventing the crack from propagating. At Divine Dental Care, many crowns can be made and fitted in a single visit using our in-house CAD/CAM milling system. Our same-day crowns page explains the process.
Same-day treatment is particularly valuable for cracked teeth because it eliminates the wait for a laboratory crown and the period with a temporary, during which the cracked tooth remains vulnerable to further damage.
If the crack has extended into the pulp (the nerve chamber inside the tooth), the nerve becomes inflamed or infected. The tooth will need a root canal to remove the damaged nerve before a crown can be placed. The root canal saves the tooth from extraction; the crown saves it from fracturing.
If the tooth has split, or the crack extends vertically below the bone level into the root, the tooth may not be saveable. Extraction is sometimes the only option. After extraction, the gap can be addressed with an implant, a bridge, or a denture.
The progression is predictable: an untreated crack worsens. A crack that today needs only a crown may next month need a root canal plus crown. Six months later, it may have split beyond repair and need extraction followed by an implant. Each stage is more invasive, more time-consuming, and more expensive than the one before it.
The difficulty is that cracked teeth often cause intermittent pain. You might think it is getting better on its own because the pain is not constant. It is not getting better. The crack is simply not being loaded at the angle that provokes it every time you chew.
If you have a tooth that hurts when you bite on it, gives a sharp pain when you release the bite, or is sensitive to cold in a way that is new, bring it in. Cracked tooth diagnosis often requires more than an X-ray: special dyes, transillumination (shining a light through the tooth to reveal the crack line), and bite tests are used to locate and characterise the crack.
At Divine Dental Care, we have the imaging, the diagnostic tools, and the in-house milling to assess and treat a cracked tooth in the same appointment for suitable cases. No need to drive to Eastland or into the CBD for imaging or a specialist referral unless the case specifically requires it.
For patients in Croydon, Ringwood East, Bayswater, Heathmont and Montrose, we are at 59 Wicklow Ave, a short walk from Croydon station. Saturday appointments are available.
Call (03) 9725 8040 or book online.
This article is general information about types of tooth cracks and treatment options. It is not personal dental advice. Your dentist will assess your specific tooth and recommend the treatment that suits your situation.