Cracked Tooth: What to Do, When It's Urgent, and What Treatment Looks Like

A cracked tooth is one of the more unsatisfying dental diagnoses because cracks are often invisible on X-rays, cause pain that is hard to pinpoint, and can be completely asymptomatic until something goes wrong. Here is how to think about what kind of crack you have and what to do about it.

The types of cracks, from least to most serious

Craze lines are microscopic fractures in the outer enamel layer. They are extremely common in adults, do not cause symptoms, and do not need treatment. They may look like thin hairlines under strong light. If a dentist spots these and recommends treatment, get a second opinion.

Fractured cusp happens when a piece of the chewing surface breaks off, usually around a large filling. It rarely reaches the pulp, so a root canal is often not needed. A crown typically handles it.

Cracked tooth is the classic version: a crack that starts at the chewing surface and runs vertically toward the root. The hallmark is sharp pain when you bite down and release. The crack opens under pressure and closes when you let go, causing that characteristic sharp jolt. How far down the crack extends determines whether a crown saves the tooth or whether a root canal is also needed.

Split tooth is what happens to a cracked tooth that was not treated in time. The crack runs through the entire tooth, creating two separate segments. A split tooth almost always needs extraction. The part of the tooth that can be saved depends on where the split ends.

Vertical root fracture starts at the root and runs up. It may have no symptoms for years until the surrounding bone and gum get infected. These almost always mean extraction.

The symptom that tells you something is wrong

Pain when biting and releasing is the cracked tooth pattern. Hot and cold sensitivity is common too. The pain is often hard to reproduce consistently, which frustrates patients and can make diagnosis difficult.

If the dentist is having trouble confirming the crack, they may use a bite stick (a small plastic rod you bite down on one tooth at a time) to reproduce the pain on the specific tooth. Transillumination (shining a bright light through the tooth) can reveal cracks that X-rays miss.

When to go in urgently

Same-day or next-day care is warranted if:

• The pain is sharp and severe when biting
• You have swelling around the tooth or along the jaw
• You have a fever in addition to tooth pain
• A piece of the tooth has physically broken off

Swelling and fever alongside tooth pain can mean the crack has let infection reach the pulp and the bone. That is not a situation to manage with ibuprofen and a scheduled appointment three weeks out.

What treatment usually looks like

For most cracked teeth that have not reached the pulp, a crown is the treatment. The crown splints the crack closed so it cannot flex under biting pressure. Without a crown, the crack continues to propagate. The longer you wait, the more likely you are to need a root canal along with the crown, or to lose the tooth altogether.

If the crack has reached the pulp, you will need a root canal first, then a crown. The crown is still essential afterward because the tooth becomes more brittle without its blood supply and is at higher risk of splitting if unprotected.

If the crack has already split the tooth or reached deep into the root, extraction is usually the honest answer. A dentist who tells you a deeply split tooth can be saved with more expensive treatment is worth questioning.

How to protect the tooth while you wait for an appointment

Avoid chewing on the cracked side. Stick to soft food. Over-the-counter temporary dental cement (available at most pharmacies) can protect a tooth if a piece has broken off and the exposed area is sensitive. It is not a treatment, just a bridge until your appointment.

Finding a practice that handles this well

A cracked tooth requires a practice that takes pain seriously, does a thorough diagnostic workup, and is honest about prognosis. Some cracks are not worth heroic efforts to save. A dentist who recommends extraction when appropriate is serving your long-term interest, not a simpler schedule.

Dentalist predicts honesty and communication quality from verifiable practice signals, so you can shortlist practices that tend to give straight answers before you are sitting in the chair with a cracked tooth and a time-sensitive decision.

Sources

• American Association of Endodontists. "Cracked Teeth." Dental Colleague Resource. 2025.
• Berman LH, Kuttler S. "Fracture neovascularization as a consequence of orthodontic forces." Journal of Endodontics. 2010.
• American Dental Association. Cracked Tooth Syndrome: Diagnosis and Management. 2024.

Related

• What to Expect During a Root Canal
• What Is a Dental Crown?
• Dental Emergency Guide