By the Lakehurst Dental Team · Medically reviewed by Brian S. Klohn, DMD, University of Pennsylvania School of Dental Medicine, 1991 · Lakehurst Dental, 19 Union Avenue, Lakehurst, NJ
Quick Answer
A chip is a piece broken off the outside of a tooth and is usually straightforward — smoothing, bonding, a veneer or a crown depending on size. A crack is a line of fracture running into the tooth, and it is the more serious of the two because it can propagate under normal chewing until the tooth splits. The classic sign of a crack is sharp pain when you release a bite rather than when you apply it. Chips can often wait for a routine appointment; a cracked tooth that hurts on biting should be seen promptly, because catching it before it splits determines whether the tooth can be saved.
What This Article Covers
- Chip Versus Crack: the Distinction That Determines Everything
- Why the Pain on Release Is the Giveaway
- What Causes Teeth to Break
- The Treatment Options, Least to Most Involved
- What to Do Before You Get to the Office
- Preventing the Next One
- Frequently Asked Questions
Chip Versus Crack: the Distinction That Determines Everything
People use the words interchangeably. Clinically they describe different problems with different risks.
| Chip / fracture of a piece | Crack | |
|---|---|---|
| What it is | A piece has broken away | A fracture line running into the tooth, often with nothing missing |
| Visible? | Usually | Often not — can be invisible to the eye and to X-rays |
| Typical symptom | Rough edge, sometimes sensitivity | Sharp pain on releasing a bite; unpredictable |
| Does it progress? | Not usually on its own | Yes — can extend with normal chewing |
| Urgency | Often routine | Prompt assessment |
The reason cracks are treated more urgently is that their outcome is time-dependent in a way chips are not. A crack confined to the crown of the tooth is often restorable. A crack that has extended below the gum and into the root frequently is not, and the tooth is lost. The same crack, caught at two different points, produces two entirely different outcomes.
Why the Pain on Release Is the Giveaway
This symptom is worth understanding because it is so specific, and because patients rarely describe it unprompted.
When you bite down on a cracked tooth, the segments separate very slightly under load. The pain often comes as you release, when those segments snap back together and the fluid movement within the dentine tubules jolts the nerve.
So the report is characteristically odd: it does not hurt all the time, it does not hurt with every food, and it may only happen on one specific spot with one specific texture. People frequently describe it as “sometimes there is a zing and then it is fine.”
That unpredictability is why cracked teeth are often lived with for months. It is also why, if you have noticed it, saying so specifically — “sharp pain when I let go, on this tooth, sometimes” — genuinely shortens the path to finding it. Cracks are frequently invisible on X-rays, so the history matters more than usual.
What Causes Teeth to Break
- Large old fillings. The most common underlying reason. A tooth that has lost a lot of internal structure to a big filling has thin remaining walls, and those walls flex under load. Cusps break off around large fillings far more often than they break in intact teeth.
- Grinding and clenching. Sustained heavy force fatigues the tooth over years. Many cracks are the end point of bruxism.
- Biting something hard unexpectedly — an olive stone, a popcorn kernel, ice, a bone fragment. The surprise element matters; the jaw is not braced.
- Trauma — a fall, an elbow, a sporting impact.
- Root canal treated teeth that have not been crowned. These become more brittle and are notably more prone to fracture, which is the main reason a crown is usually recommended afterwards on back teeth.
- Large temperature swings — something very hot followed immediately by something very cold.
- Using teeth as tools. Opening packaging, cutting thread, holding pins.
The Treatment Options, Least to Most Involved
1. Smoothing and polishing
For a very small chip in enamel with no sensitivity, the edge is simply smoothed. Quick, usually no anaesthetic, no material added. If a chip is only a cosmetic annoyance and the tooth is otherwise sound, this is often all that is needed.
2. Composite bonding
Tooth-coloured resin is shaped onto the tooth and hardened, rebuilding the missing corner. Usually a single visit, often without anaesthetic, and reversible in the sense that little or no tooth is removed. It is the workhorse for small to medium chips, especially on front teeth.
Its limitation is longevity — composite can stain and chip over time and may need refreshing. That trade-off is usually worth it for the conservatism.
3. Reattaching the fragment
If you have kept the broken piece and it is intact, it can sometimes be bonded back on. Keep any fragment in milk and bring it. It does not always work, but when it does, the colour and translucency match perfectly because it is the original tooth.
4. A veneer
For a front tooth with a larger chip, or where the tooth is also discoloured or misshapen, a porcelain veneer covers the visible surface. More tooth preparation than bonding, better longevity and stain resistance.
5. A crown
Where a substantial portion has broken away, where a cusp has fractured off, or where a crack needs to be held together, a crown covers the whole tooth. Crucially, a crown does something bonding cannot: it binds the tooth circumferentially, resisting the flexing that drives a crack deeper. For a cracked tooth, that is the entire point.
6. Root canal, then a crown
If the break has exposed the pulp, or if the nerve is already irreversibly inflamed, root canal treatment comes first and the crown follows.
7. Extraction
When a crack extends below the gumline into the root, or the tooth has split into separate segments, it usually cannot be restored predictably. Removal followed by an implant, bridge or partial denture becomes the discussion. This is the outcome that catching a crack early is meant to avoid.
What to Do Before You Get to the Office
- Save any fragment in milk, not water and not dry.
- Rinse gently with warm water.
- Avoid chewing on that side entirely. With a suspected crack this is the single most useful thing you can do — every load risks extending it.
- Cold compress on the outside of the face if there is swelling.
- Over-the-counter pain relief as directed. Do not place aspirin against the gum; it burns the tissue and does nothing for the tooth.
- Cover a sharp edge with orthodontic wax or sugar-free gum if it is cutting your tongue or cheek.
- Call the same day if you can see pink or red at the centre of the break, there is bleeding from within the tooth, there is significant pain, or there is any swelling.
Preventing the Next One
Breaks are rarely bad luck alone. Most have a contributing cause that can be addressed.
- If you grind, get it protected. A night guard absorbs load that would otherwise fatigue teeth. If you have broken one tooth from clenching, the others are under the same forces.
- Ask about large old fillings before they break. A tooth with a very large filling and thin remaining walls is a predictable future fracture. Replacing that filling with a crown or onlay while the tooth is intact is straightforward. Doing it after a cusp snaps off is often not.
- Crown root-canal-treated back teeth. This is the standard recommendation and it exists precisely because these teeth fracture.
- Wear a mouthguard for contact sport. Custom-fitted ones get worn; boil-and-bite ones frequently do not.
- Stop using your teeth as tools, and stop chewing ice.
Frequently Asked Questions
The most characteristic sign is a sharp pain when you release a bite rather than when you apply it, often on one specific tooth and only with certain foods. It tends to be unpredictable rather than constant. Cracks are frequently invisible to the eye and often do not show on X-rays, so describing that symptom specifically is genuinely useful. Other clues include sensitivity to cold on one tooth and discomfort that comes and goes for weeks or months.
It is urgent rather than an emergency in most cases, but it should not be left. A crack can extend under normal chewing, and the outcome depends heavily on how far it has travelled. A crack contained within the crown is often restorable with a crown; one that has extended below the gumline into the root usually is not, and the tooth is lost. Avoid chewing on that side and book promptly. Visible pulp, bleeding from within the tooth, or swelling means same-day care.
Usually yes. A small chip may only need smoothing, which takes minutes and often needs no anaesthetic. A larger chip is commonly rebuilt with composite bonding, which is shaped and hardened in a single appointment. If you kept the broken fragment and stored it in milk, it can sometimes be bonded back on with an excellent colour match. Crowns and veneers generally take two visits, or one if the office makes them on site.
A filling sits inside the tooth and does nothing to stop the walls flexing apart under load, which is what drives a crack deeper. A crown covers and binds the tooth all the way around, holding the segments together and resisting that flexing. That circumferential support is the specific reason it is chosen for cracks. A filling in a cracked tooth can allow the fracture to continue propagating until the tooth splits.
A large filling means a large amount of the tooth’s internal structure was lost to decay and replaced. What remains are thinner walls and cusps, and those flex under chewing forces in a way an intact tooth does not. Over time that flexing fatigues them until a cusp fractures away. This is why replacing a very large filling with a crown or onlay before it breaks is often recommended — treating it while the tooth is whole is far simpler than afterwards.
Back teeth that have had root canal treatment are more prone to fracture, partly because significant tooth structure has been removed and partly because the tooth becomes more brittle. This is the main reason a crown is usually recommended after root canal treatment on a molar or premolar — it protects against the fracture that would otherwise be a real risk. Front teeth with conservative access sometimes do not need full coverage.
Yes, if you can find it and it is reasonably intact. Store it in milk rather than water and bring it with you. Fragments can sometimes be bonded back into place, and when that works the colour and translucency match perfectly because it is the original tooth structure. It does not always succeed, particularly with very small or multiple pieces, but it costs nothing to keep it and the option is worth having.
Speak With a Dentist in Lakehurst
If a tooth has broken, or one particular tooth has started giving you a jolt when you chew, we can tell you quickly which of these you are dealing with. Lakehurst Dental has cared for families in Lakehurst, Toms River and across Ocean and Monmouth counties for more than 34 years. To ask a question or arrange a consultation, call (732) 943-4090 or contact our office.
This article is general information and is not a substitute for an examination and personal advice from your dentist.