Chipped or Cracked Tooth: Causes, Repair Options and When to Call

A chipped tooth can usually be repaired, often with tooth-coloured bonding, a filling or a crown, depending on how much tooth is lost and how deep the damage goes. A cracked tooth is less predictable. Pain when biting, sensitivity that lingers, or a crack you can feel means you should call a dentist soon.

Key Takeaways

• A chipped tooth has lost a piece of its outer surface, while a cracked tooth has a fracture line that may run deeper toward the nerve or root.
• Small chips are often repaired with composite bonding or smoothing; larger breaks may need a filling, onlay or crown.
• A crack that reaches the pulp may need root canal treatment, and a tooth split below the gum line may not be saveable.
• Cracked tooth symptoms can come and go, so a tooth that only hurts sometimes when you chew still deserves an exam.
• Most chips and cracks are same-day or next-day dental office problems; facial injury, uncontrolled bleeding or trouble breathing need 911 or the hospital.

If the damage just happened and you want to know what to do in the first hour, start with our guide to next steps after a broken tooth. This article picks up from there: what kind of damage you may have, and how a dentist may repair it.

What is a chipped tooth, and how is it different from a cracked tooth?

A chipped tooth is a tooth that has lost a small piece of enamel, and sometimes the dentin beneath it, usually from an edge or a corner. Chips are most noticeable on front teeth, where they change the shape of the smile or leave a sharp edge the tongue keeps finding.

A cracked tooth has a fracture line running through it rather than a missing piece. The crack may be a surface line in the enamel, or it may extend down through the tooth toward the pulp (the nerve and blood supply inside) or the root. Cracks are often hard to see, even for a dentist, and they can grow slowly over months.

The difference matters because the two problems behave differently. A chip is usually stable once it happens: what is lost is lost, and the repair replaces it. A crack can keep spreading with every bite, so the goal of treatment is often to hold the tooth together and protect it before the crack reaches a point where the tooth cannot be kept.

Both can happen at the same time. A corner of a molar may break off along a crack that started years earlier, which is why a dentist examines the whole tooth rather than only the piece that is missing.

Types of chips and cracks

The American Association of Endodontists describes five main types of cracked teeth. The table below summarizes them alongside common chip patterns, with the kinds of treatment a dentist may discuss for each. The final plan always depends on an exam.

Type of damage	What it is	Typical symptoms	Repairs a dentist may discuss
Minor enamel chip	Small piece of enamel lost from an edge or corner	Rough or sharp edge; usually no pain	Smoothing and polishing, or composite bonding
Larger chip into dentin	Break exposes the yellower layer under the enamel	Sensitivity to cold, sweet or air	Bonding, filling, onlay or crown
Craze lines	Very shallow lines in the outer enamel only	None; cosmetic	Often no treatment; monitoring
Fractured cusp	A pointed chewing corner breaks off, often near a large filling	Sharp edge, mild sensitivity; rarely nerve pain	Filling, onlay or crown
Cracked tooth	Crack runs from the chewing surface down toward the root	Pain on biting or release, sensitivity that comes and goes	Crown; root canal treatment if the pulp is involved
Split tooth	A crack that has progressed until the tooth separates into parts	Pain when chewing; a segment may move	Sometimes part can be kept; often extraction
Vertical root fracture	Crack starts in the root and grows toward the chewing surface	Often mild or none until the gum or bone becomes infected	Sometimes endodontic surgery; often extraction

The AAE stresses that early diagnosis is what gives a cracked tooth its best chance of being saved. A crack that is treated while it is still above the gum line has more options than one that has already split the tooth.

Cracked tooth symptoms to watch for

Cracked tooth symptoms are frustrating because they are inconsistent. The AAE describes pain that ranges from erratic discomfort when chewing to sudden pain when the tooth meets very hot or cold temperatures, and the pain may come and go.

Signs that point toward a crack include:

• a sharp twinge when you bite down on something specific, such as a seed or crust;
• pain when you release the bite, not only when you clench;
• sensitivity to cold or sweet that fades within seconds but keeps coming back;
• a tooth you "baby" by chewing on the other side without quite realizing why;
• gum tenderness or a small bump on the gum near one tooth, which may mean infection has followed the crack.

A chipped tooth, on the other hand, usually announces itself. You feel the rough edge, see the gap in the mirror or find the fragment. Many chips do not hurt at all, especially small ones on front teeth. No pain does not always mean no problem, though, because a chip on a back tooth can hide a crack beneath it.

How a dentist finds a crack

A cracked tooth often does not show clearly on a regular dental X-ray, because the crack line may run in a direction the X-ray beam does not catch. Your dentist may combine several clues: your description of when it hurts, a bite test on each cusp, cold testing, magnification, a dye or bright light on the tooth, a look at the gum around it, and X-rays to check the nerve and bone. An intraoral camera photo can help you see what the dentist sees.

What causes teeth to chip or crack?

Teeth chip and crack when the force on them is more than the tooth structure can take. That can be one sudden impact or years of smaller stresses.

Common causes include:

• Biting something hard: ice, popcorn kernels, hard candy, olive pits, bones and pen caps.
• Falls and sports injuries: hockey, basketball, cycling and backyard accidents are frequent sources of chipped front teeth.
• Clenching and grinding: night-time grinding (bruxism) loads the back teeth heavily and is a common cause of cracks and fractured cusps.
• Large old fillings: a tooth that is mostly filling has less natural structure to resist chewing forces, so its remaining walls can break.
• Decay: cavities weaken enamel from the inside, so a tooth may break during ordinary chewing.
• Using teeth as tools: opening packages, bottles or tape puts force on edges that are not designed for it.
• Wear over time: teeth accumulate wear and small stresses over decades, so older, heavily used teeth are more vulnerable.

Some of these are preventable. A custom sports mouthguard protects front teeth from impact, and a night guard can reduce the load from grinding. Your dentist can tell you which one suits your situation.

Chipped tooth repair options

Chipped tooth repair ranges from a few minutes of polishing to a multi-visit crown or referral. Emergency dentistry is often the first step, so the tooth is assessed and protected; the final repair may be the same day or planned for a later visit. The main options are below.

Smoothing and polishing

A very small chip, especially one that has only left a rough edge, may simply be smoothed and polished. This removes the sharp spot without adding material. It is quick and conservative, but it only works when the amount of lost enamel is tiny and the shape of the tooth still looks natural.

Bonding a chipped tooth

Bonding a chipped tooth means rebuilding the missing piece with tooth-coloured composite resin. The dentist roughens the surface slightly, applies a bonding agent, then shapes and hardens the resin in layers before polishing it to match the neighbouring teeth. The American Dental Association notes that composite resin is well suited to repairing chips and fractures on front teeth and that it bonds directly to tooth structure.

Bonding has limits. Composite can stain over time and can chip again if it takes heavy biting forces, and how long it lasts depends partly on habits such as grinding and chewing hard objects. For a larger cosmetic concern, your dentist may compare bonding with a porcelain veneer; our article on bonding versus veneers covers that trade-off. Bonding is part of the practice's cosmetic dentistry services as well as everyday repair.

Fillings, inlays and onlays

When a chip or fractured cusp involves a chewing surface, a filling may be enough. Landmark Dental Care offers both composite and amalgam fillings. If a larger area is missing but the tooth does not need full coverage, an inlay or onlay (a custom piece made to fit the gap) may be an option.

Crowns

A crown is a cap that covers the whole visible part of the tooth. According to the ADA's MouthHealthy site, a crown can protect a weak tooth from breaking or restore one that is already broken. For a cracked tooth, a crown works partly by holding the walls of the tooth together so the crack is less likely to spread. It does not "glue" the crack shut, and if the crack already reaches the root, a crown may not be enough.

Root canal treatment

If a crack or deep break reaches the pulp, the nerve can become inflamed or infected. Root canal treatment removes the damaged pulp, cleans the inside of the tooth and seals it, and a crown is usually placed afterward. Depending on the complexity of the tooth, your dentist may do this at the practice or refer you to an endodontist (a root canal specialist).

Extraction

When a tooth has split, or a crack extends well below the gum line or down the root, the AAE notes that extraction may be the only option. Landmark Dental Care lists extractions among its services. Replacing the tooth afterward, with an implant crown, bridge or denture, is a separate discussion you can have once the area has healed.

How to choose between repairs, and what affects cost

Your dentist chooses a repair based on the tooth, not the price list, but it helps to understand what drives the recommendation.

• Size and location: a small chip on a front tooth is a different problem from a missing cusp on a back molar that takes full chewing force.
• Depth: enamel-only damage has more conservative options than a break that exposes dentin or pulp.
• Existing fillings: a tooth that is already heavily filled often needs coverage rather than another patch.
• Your bite and habits: grinding and clenching push recommendations toward stronger options and a night guard.
• Appearance: front teeth call for colour matching and shape; your preferences matter here.

These same factors affect cost. A polish or small bonding repair takes one short visit, while a crown usually involves more than one appointment and a dental laboratory, and a root canal adds its own fee. Your dentist can give you an estimate before any work is done. Insurance coverage varies by plan; if you are asking about the federal program, see our Canadian Dental Care Plan page and call the office to confirm current participation and billing.

Waiting can change the options. A cracked tooth that is crowned early may avoid root canal treatment, and a split tooth usually cannot be rebuilt. If a repair is recommended but you need time to plan, ask what the risk of waiting is for that specific tooth.

Special situations

Children and baby teeth

Children chip front teeth often, usually from falls. A chipped baby tooth may be smoothed or bonded, or simply watched, depending on how close it is to falling out naturally. Because a blow to a baby tooth can affect the permanent tooth developing underneath, call the dental office after any facial injury in a young child, even if the chip looks minor.

Teens and athletes

Chips and cracks on permanent front teeth in teenagers are commonly sports-related. Repairs are usually conservative at this age, and bonding can often be updated later. A mouthguard is the best protection once the tooth is repaired.

Pregnancy

Many dental repairs can be done during pregnancy, and treating a painful or infected tooth is not something to postpone. Tell the dental team you are pregnant so they can plan timing and any X-rays accordingly.

Seniors and heavily restored teeth

Older teeth with large fillings are the most common candidates for fractured cusps and cracks. If a tooth has an old large filling and has started to feel "different" when you bite, mention it at your next checkup rather than waiting for it to break.

Dental anxiety

If you have been putting off care because of anxiety, say so when you call. Knowing that the first visit may only be an assessment, with no treatment unless you agree, helps many people get the tooth looked at before a small problem grows.

Getting a chipped or cracked tooth checked in Truro

Landmark Dental Care is a family general practice at 125 Queen St in downtown Truro, open Monday to Friday, 8:30am to 5:00pm. We see patients from Truro, Bible Hill and across Colchester County led by Dr. J. Peter Thomson, D.D.S., and restorative dentistry is a special area of interest at the practice.

It helps to know which kind of help you need:

Situation	Where to go
Small chip, rough edge, no pain	Call the dental office to book a visit in the next few days
Sensitivity, pain on biting, a visible crack or a large piece missing	Call the dental office today
Pain with swelling of the gum or face that is not spreading	Call the dental office today
Facial injury, possible broken jaw, bleeding that will not stop, swelling that is spreading or making it hard to breathe or swallow	Call 911 or go to the Emergency Department at the Colchester East Hants Health Centre, 600 Abenaki Rd, Truro
Unsure, or it is after hours	Call 811 to speak with a registered nurse, any time

The emergency department at the Colchester East Hants Health Centre is open 24 hours a day and can manage serious injuries and spreading infection, but hospital staff usually do not repair teeth, so you will still need a dental visit once you are safe. If you are not sure whether your situation is urgent, our article on what counts as a dental emergency may help.

FAQ

Can a chipped tooth heal on its own?

No. Enamel does not grow back, so a chip stays the same size or gets larger. A very small chip may not need treatment beyond smoothing, but a dentist should check it to make sure there is no crack underneath.

Is a chipped tooth an emergency?

Most chipped teeth are urgent rather than emergencies: call the dental office the same or next day. It becomes more urgent if you have strong pain, a large piece missing, or pink or red visible in the tooth, and it becomes a hospital matter if it is part of a facial injury or bleeding you cannot control.

How long does bonding on a chipped tooth last?

Bonding can last for years, but it is not permanent. Composite can stain and can chip again with grinding, nail biting or chewing hard foods, so your dentist may need to touch it up or replace it over time.

Can a cracked tooth be saved?

Often, yes, if it is treated early. A crack that stays above the gum line can frequently be protected with a crown, sometimes after root canal treatment. A tooth that has split or cracked down the root may need to be removed.

Why does my cracked tooth only hurt sometimes?

Cracks can open slightly under certain biting pressures or temperatures and then close again, which irritates the nerve briefly. That on-and-off pattern is typical, and it does not mean the crack has healed.

Next step

If you have a chip, a crack or a tooth that hurts when you bite, book an assessment for a chipped or cracked tooth with our emergency dentistry team. Call 902-893-2919 or visit the contact page; we are at 125 Queen St, Truro, and will let you know how soon you should be seen.

References

• American Association of Endodontists: Cracked Teeth
• American Dental Association: Materials for Direct Restorations
• ADA MouthHealthy: Crowns
• ADA MouthHealthy: Dental Emergencies
• Nova Scotia Health: Colchester East Hants Health Centre
• Government of Nova Scotia: 811

This article provides general educational information and is not a diagnosis or a substitute for care from a dentist or other qualified health professional.