What Is a Slab Fracture? Understanding Broken Teeth in Dogs and Cats

By Dr Duncan Houston

You might notice a piece missing from your dog's tooth while brushing their teeth, or your vet might discover it during a routine check. The term “slab fracture” describes a section of tooth that has split away, sometimes leaving a broad, exposed surface.

Although the damage can be easy to overlook, it deserves attention. Dogs and cats often show surprisingly little outward reaction to dental pain, so an apparently normal appetite cannot tell you whether the tooth is comfortable.

Quick answer

A dental slab fracture happens when a sheet-like section breaks away from the side of a tooth. It commonly affects a dog's large upper fourth premolar, towards the back of the mouth. Treatment depends on whether the fracture exposes the tooth's sensitive inner tissues, extends below the gum or leaves a tooth that can be repaired.

Contact your vet when you notice a broken tooth. Do not wait for your pet to stop eating before seeking advice.

What actually breaks?

A tooth has three main layers:

• Enamel: the hard outer covering of the crown.

• Dentine: the layer beneath the enamel, containing tiny channels connected to the inner tooth.

• Pulp: living tissue containing nerves and blood vessels.

A slab fracture can remove enamel and dentine, and a deeper break may open the pulp cavity. Exposed dentine can be sensitive even when the pulp remains covered. If the pulp is exposed, bacteria from the mouth can enter, causing inflammation, infection and eventually the death of the pulp. Infection can then affect tissues around the roots.

Vets describe fractures without pulp exposure as uncomplicated and fractures with pulp exposure as complicated. A fracture involving both the crown and root is called a crown-root fracture. “Uncomplicated” describes the anatomy; it does not mean that the injury can safely be ignored.

The broken slab may remain attached to the gum, hiding damage underneath and appearing as a crack or loose edge.

What causes a slab fracture?

A common cause is biting down on something too hard for the tooth to withstand.

The upper fourth premolar is a carnassial tooth. It works with a lower tooth to shear food. When a dog applies strong chewing pressure to a rigid object, a section of the tooth can split away.

Potential culprits include bones, antlers, hooves and very hard manufactured chews. These objects can damage teeth even when marketed for dogs. Some also pose a risk of digestive injury or blockage if pieces are swallowed.

A dog having chewed the same object for months without a problem does not make the next chewing session safe. Your vet can help you choose alternatives suited to your dog's size and chewing behaviour.

What signs might you notice?

Look for changes such as:

• Chewing on one side or dropping food.

• Avoiding hard food, treats or favourite toys.

• Drooling or pawing at the mouth.

• Pulling away when the face is touched.

• Swelling around the face.

Some dogs show none of these obvious signs. They continue eating and playing while avoiding pressure on the damaged tooth.

A pink, red or dark area on the broken surface may represent exposed pulp, but colour alone cannot establish the depth or health of the tooth. Dental infection can also cause facial swelling or a draining sore.

A tooth does not have to be bleeding to need treatment. Old fractures can still contain infected or dead pulp.

How urgently does your pet need a vet?

Call your clinic when you discover the fracture and describe what you can see, when it happened and how your pet is behaving. The following is a practical guide to seeking care; your clinic should determine the timing for your individual pet.

What you notice	What to do
Difficulty breathing or swallowing, serious facial trauma, collapse or heavy bleeding that continues	Seek emergency veterinary care immediately.
A fresh fracture with visible pink or red tissue, a loose slab, obvious pain, facial swelling or refusal to eat	Contact a vet the same day for assessment and pain relief advice.
A chipped or damaged tooth with no obvious discomfort	Arrange a prompt examination rather than waiting for the next annual dental check.

Fresh pulp injuries need prompt attention because treatments that preserve living pulp are time-sensitive, especially in young permanent teeth.

What should you do at home?

While arranging veterinary care:

1. Remove hard chews and toys. Pause tug games and activities that put pressure on the mouth.

2. Ask about feeding. Soft food may be more comfortable if your pet can swallow normally, but check for fasting instructions if a procedure might be needed.

3. Leave the damaged tooth alone. Do not pull off an attached fragment, probe a hole, file a sharp edge or try to glue the tooth.

4. Avoid brushing directly over the fracture. Do not force your pet's mouth open to obtain a photograph.

5. Ask your vet about pain relief. Never give human painkillers or leftover medication without specific veterinary instructions. Some common human pain medicines can seriously harm dogs and cats.

A photograph can help a vet understand your concern if you can take it without touching the painful area. It cannot show what is happening inside the tooth or beneath the gum.

How does a vet assess the damage?

Your vet will start with your pet's history and an examination. A complete dental assessment generally requires general anaesthesia, dental probing and intraoral X-rays.

This allows the team to examine the fracture, roots, surrounding bone and other teeth, and to identify additional problems that may affect treatment.

X-rays and the physical examination provide different information. An early pulp injury may not yet have caused visible changes around the roots, so a normal-looking X-ray alone does not rule out exposed or damaged pulp.

In cats, tooth resorption is another important possibility when part of a tooth appears missing. This condition progressively destroys tooth structure and can cause the crown to break. Dental X-rays help distinguish the underlying problem and guide treatment.

How is a slab fracture treated?

The aim is a comfortable mouth and a tooth that is either successfully treated or safely removed.

Protecting a tooth without pulp exposure

Some fractures that expose dentine can be treated with a veterinary dental sealant or restoration. This protects exposed channels and reduces sensitivity.

The tooth must first be assessed for internal disease and other damage. Sealing the surface of an unhealthy tooth is not adequate treatment, and follow-up dental X-rays may be needed.

Root canal treatment

If the pulp is exposed or diseased but the tooth can be restored, root canal treatment may preserve it.

The vet removes the affected pulp, cleans and disinfects the canals, then fills and seals them. Follow-up X-rays are needed to check that treatment remains successful.

A root canal cannot solve every structural problem. A fracture extending deeply below the gum or into the area where roots divide may leave a tooth that cannot be reliably restored.

Tooth extraction

Extraction removes the damaged tooth and its roots. It may be appropriate when damage is extensive or a lasting repair is unlikely.

This can involve oral surgery, with pain relief and recovery instructions from your vet. Removing a painful tooth can substantially improve your pet's comfort once the site heals.

Vital pulp therapy

Selected recent fractures, particularly in immature permanent teeth, may be suitable for vital pulp therapy. This preserves healthy living pulp so the tooth can continue developing.

Suitability depends on the injury, timing and tooth health. Ask promptly whether referral to a veterinary dentist could help.

Can antibiotics fix it?

Antibiotics cannot repair a broken tooth or reliably eliminate infection inside a diseased root canal. The tooth still needs appropriate dental treatment.

Your vet may prescribe antibiotics when there is a particular indication, but they are not automatically required after every extraction. Pain relief and definitive treatment remain central to care.

What happens after treatment?

Follow the clinic's instructions for food, medication, activity and rechecks. Recovery needs vary with the procedure.

After an extraction, your vet may recommend soft food and a period without chewing toys while the gum heals. Give prescribed pain relief as directed, and contact the clinic if your pet will not eat, appears increasingly painful or develops new swelling or bleeding.

If the tooth has been preserved, attend the recommended dental X-ray rechecks even when your pet seems comfortable. Problems inside a treated tooth may not be visible at home.

How can you reduce the risk of another fracture?

Review the items your pet chews. Avoid very hard, rigid objects and ask your vet about more suitable options. Supervise chewing and remove items that become damaged or small enough to swallow.

Regular toothbrushing and veterinary dental checks support oral health and may help you notice changes earlier. Brushing will not repair an existing fracture.

For dental products, the Veterinary Oral Health Council's acceptance relates to evidence for reducing plaque or tartar. It does not mean every accepted product suits every dog's chewing style.

Frequently asked questions

Can a slab fracture heal by itself?

The missing section will not grow back or reattach. The action needed depends on the depth and health of the remaining tooth. A fracture exposing the pulp needs treatment, even if your pet appears comfortable.

Does every slab fracture need extraction?

No. Some teeth can be restored or saved with root canal treatment. The choice depends on the damage and whether a lasting repair is realistic.

Can an online vet diagnose it from a photo?

An online consultation can help you recognise warning signs and plan your next step. A photo cannot replace the examination and dental X-rays needed to assess the whole tooth and choose treatment.

Not sure whether you are looking at a chipped tooth, a slab fracture or another dental problem? ASK A VET™ can help you understand what you are seeing and how urgently your pet needs an in-person examination. Getting advice early helps you make a clear plan for keeping their mouth comfortable.