Chipped Tooth: When Bonding Is Enough and When It Is Not

Often your tongue finds it first. There is a sharp corner where a front tooth used to be smooth, or a rough gap on a back tooth after something crunchy.

Chipped tooth repair runs from a quick polish to a crown. Which one you need depends on how deep the chip goes and how much force that part of the tooth carries.

What decides chipped tooth repair: how deep the chip goes

The part of a tooth you see has three layers. The ADA describes the outside, enamel, as hard calcified tissue with no living cells, which is why it cannot repair itself. Under it sits dentin, and in the center is the pulp, which holds the nerves and blood vessels.

Dentin is where a chip starts to matter. The ADA explains that dentin contains microscopic tubules, tiny hollow channels. Without enamel over them, those channels let heat, cold and acidic or sticky food reach the nerve. So a chip that only took enamel usually feels rough but calm, while one that exposed dentin often stings when you drink something cold.

The second question is load: a front tooth mostly cuts food, while a back tooth crushes it. The raised corners of a back tooth, called cusps, carry that crushing load. A patch that holds on the edge of a front tooth can fail on a molar cusp.

When is smoothing or bonding enough?

The ADA's guide to common dental problems says your dentist may be able to smooth down a small chip. Polishing the rough edge stops it catching your tongue, and it adds nothing to the tooth.

A larger chip is where bonding comes in. The American Association of Endodontists (AAE) notes that a dentist can repair most chipped teeth by reattaching the broken piece or by bonding. Bonding attaches tooth-colored resin to the tooth. The dentist sculpts it into the missing shape, hardens it with a curing light and polishes it.

So keep the broken piece if you find it. Guidelines from the International Association of Dental Traumatology say a dentist can bond an intact piece back on to the tooth. They call for soaking the piece in water before bonding it. Bring it with you, and the exam will show whether it can go back.

When does a chipped front tooth need a veneer?

Rebuilding a large part of a front tooth is harder than bonding a small corner. A large patch of resin has to match the tooth around it in shape, color and shine. The ADA lists chipped or broken teeth among the reasons for a veneer. A veneer covers the whole front surface instead of patching one part of it.

Veneers come in two materials, and one difference is how much enamel comes off. Composite veneers use a tooth-colored filling material bonded to the tooth, and the ADA notes they may need less enamel removed. They are easier to fix if damaged, but the ADA adds that they are not as stain- or wear-resistant as porcelain.

Porcelain veneers are thin shells custom-made to fit the front surface. A thin layer of enamel comes off to make room for one. The ADA warns that because the dentist removes enamel to place a veneer, the treatment is not reversible.

A veneer covers only the front of a tooth. If the chip has weakened the tooth itself, the ADA points to a crown instead, which can protect a weak tooth from breaking. Our post on the crown or veneer choice goes deeper.

When does a chipped tooth need a crown?

A crown enters the picture when the break is structural. The AAE calls it a fractured cusp when a piece of the chewing surface breaks off, often around a filling. It rarely damages the nerve, and the AAE lists a new filling or a crown as the repair.

A crack is a different problem from a clean break. The AAE explains that when the hard outer layers crack, chewing can move the pieces and irritate the pulp. That is why a cracked tooth hurts on biting and can turn sensitive to hot and cold. A patch on one surface does not hold those pieces together. A crown covers the whole tooth and holds it as one unit.

Fine surface lines are different. The AAE calls tiny enamel cracks craze lines and says they cause no pain and matter only for appearance.

For a true crack, the AAE's dentist guidance is direct: all cracked teeth require a crown, though not all of them need a root canal. Timing matters, too: that guidance cites two studies of cracked teeth crowned right away, while the nerve could still recover. Those teeth had an 80% chance of never needing a root canal.

How the crown is made depends on the tooth. A straightforward crown can be designed, milled and fitted in our office in one visit. A complex or large rebuild goes to a dental laboratory, and so does a front tooth whose shade needs layering to match its neighbors. That means two visits, with a temporary crown in between. The exam decides which lane your tooth is in.

If the crack has reached the pulp, the AAE notes that a root canal and then a crown can still treat the tooth. The limit is the gum line: once a crack runs below it, the AAE says the tooth cannot be saved.

Is a chipped tooth an emergency?

A small chip that does not hurt is not a dental emergency, according to Cleveland Clinic's guide, though it still needs a visit. Call the same day if the tooth hurts or stings with hot, cold or biting. Call too if a sharp edge is cutting your tongue or cheek. Pain or a sting usually means the dentin is exposed or a crack is reaching toward the nerve.

Before your visit:

• Save any piece you find, and keep it in a little water so it does not dry out.
• Rinse your mouth with warm water, and hold a cold compress on your face if it swells.
• Cover a sharp edge with orthodontic wax.
• Chew on the other side and skip very hot or cold drinks.

We see urgent problems the same day during office hours when the schedule allows. Our emergency page covers what happens when you call, and when a hospital emergency room is the right place instead.

Why does a tooth that chipped once chip again?

A chip is a sign that one spot took more force than it could hold. Sometimes the cause is a one-off, like a fork or an olive pit. Sometimes it is the bite itself: grinding during sleep, which the ADA lists among the habits that raise the risk of a chip. The AAE's advice is that if you clench or grind in your sleep, you ask your dentist about a mouthguard.

Repair the chip without dealing with that force and the new edge takes the same load the old one did. The AAE's guidance for dentists names the repeated stress of grinding as a likely reason a crack spreads into a fracture. Bonding resin itself can chip over time, and a grinding bite loads it the same way.

That is why the bite deserves a look before the repair is chosen. If you grind, a night guard sits between your teeth at night, so the grinding lands on the guard instead of the repaired edge.

How do you find out which repair your tooth needs?

An exam decides it: how deep the chip goes, how much load that tooth carries, and whether your bite is part of the cause.

Book an appointment or call (703) 444-5108. If the tooth hurts, call first so we can find the soonest slot.