SYMPTOM
Broken or chipped tooth
Owners typically spot a visibly broken or chipped tooth after chewing something hard, such as a bone, antler, or stone, or notice a rough or discoloured edge that looks different from the teeth around it.
Enamel-Only Chip
A small chip confined to the outer enamel layer, without exposing the yellower dentine or pink pulp beneath, is largely a cosmetic finding in many cases and does not necessarily indicate ongoing pain. In cats, the pulp runs almost to the tip of the canine (fang) teeth, so even a small piece missing from the tip of a cat's fang often exposes the pulp. Enamel-only chips are common after chewing on hard toys, bones, or stones, and the tooth often remains structurally sound afterwards. Telling a chip that is genuinely confined to enamel apart from one that has also exposed the underlying dentine is not always straightforward by eye alone, and one study of fractured teeth in dogs with no visible pulp exposure found that a proportion showed infection at the root tip on dental radiographs despite an outwardly unremarkable appearance, so a chip that looks minor does not reliably rule out deeper involvement. Radiographs, rather than appearance alone, are what characterise the extent of the damage.
Complicated Crown Fracture With Pulp Exposure
Where the fracture extends into the pulp chamber, visible as a pink, red or black central spot on the broken surface, the nerve and blood supply of the tooth are exposed to the oral environment. This pattern is associated with ongoing discomfort and gives bacteria a direct route to the tooth root, and pulp tissue exposed in this way typically undergoes progressive inflammation and, without intervention, infection at the root tip over time.
Tooth Resorption Weakening The Crown
In cats particularly, tooth resorption is a common process where tooth structure is gradually broken down by the body's own cells, usually starting on the outer root surface near the gumline, leaving a crown that can fracture with minimal force during normal chewing. A tooth that breaks while eating soft food or during gentle play, rather than during hard chewing, points towards this underlying weakening rather than acute trauma. This process is separate from decay and reflects active resorption affecting the tooth itself.
Periodontal Disease Alongside The Fracture
Periodontal disease is often present alongside a broken tooth, and a tooth with advanced bone loss tends to loosen and be lost rather than fracture. Periodontal disease is more common in small and toy breed dogs with crowded dentition and in older cats and dogs generally, and often sits alongside visible tartar or mobility in neighbouring teeth. In small and toy breed dogs, severe bone loss around the lower first molar can weaken the jaw itself enough to fracture under minimal force.
Acute Trauma
A fall, road traffic incident, or fight with another animal can fracture a tooth. The same force can cause injuries that are not visible at first, such as bleeding into the chest or abdomen, bruised lungs or air around the lungs, and these can worsen over the following hours in a pet that initially seems well. Facial swelling, jaw asymmetry, a mouth that does not close normally, or bleeding from the mouth can reflect a jaw fracture. Trauma-related fractures often affect the canine teeth or incisors specifically, given their prominent position at the front of the mouth.
Why timing matters
Early observation
In the hours to days after a fracture, the appearance of the broken surface gives an early indication of pulp involvement: a pink or red centre usually means the pulp is exposed and still alive. Exposed pulp is painful from the outset and does not heal over on its own. Oral bacteria reach it straight away, but at first the inflammation is confined to the surface layer of the pulp, with healthy tissue deeper in the tooth. Treatment that aims to keep the tooth alive (vital pulp therapy) relies on that healthy tissue and depends heavily on timing: in one study of 97 fractured canine (fang) teeth in 76 dogs, 88% of teeth treated within 48 hours of the pulp being exposed were still alive three years later, against 41% of those treated within one week and 24% of those treated within three weeks. In adult dogs and cats, root canal treatment or extraction are the usual options once 48 hours have passed.
Later presentation
Over subsequent weeks, an exposed pulp left unaddressed typically undergoes necrosis, meaning the visible pink centre darkens and the nerve dies, after which apparent discomfort may paradoxically seem to lessen even as infection develops at the root tip.
This is a case where reduced apparent discomfort over time does not indicate resolution; a fractured tooth that stops looking painful weeks after the event has often simply moved from an acutely sensitive exposed nerve to a chronically infected, non-vital tooth.
Conditions commonly associated
Dental Disease in Dogs
Fractured teeth are frequently found alongside broader periodontal disease, and both can be sources of oral pain.
Periodontal Disease
Periodontal disease often coexists with fractured teeth, and in small and toy breed dogs severe bone loss around the lower first molar can lead to a fracture of the jaw itself under minimal force.
Tooth Resorption
The progressive breakdown of tooth structure in resorption, which usually starts on the outer root surface near the gumline, can leave a crown weak enough to fracture during ordinary chewing or while eating soft food.
Osteomyelitis
Untreated infection tracking from a fractured tooth root can extend into the surrounding jawbone, producing a deeper bone infection.
When to explore further
A pink, red or black spot at the centre of the broken surface can indicate a fracture into the pulp rather than a surface-only chip. A smooth brown spot on a worn tooth is often protective dentine laid down by the tooth, and the two are told apart on examination with a fine dental probe, usually under sedation or anaesthesia.
A tooth that breaks while eating soft food, during gentle chewing, or with no clear preceding event may point towards an underlying process such as resorption rather than one-off trauma.
Reluctance to chew on one side, dropping food, or pawing at the mouth after a chip suggests discomfort. Where the pulp is exposed, pain is present from the start, so these signs do not need to persist for days to be meaningful, and their absence does not rule pain out.
Facial swelling, particularly below the eye, or a draining tract on the face can indicate infection tracking from a fractured tooth root.
Multiple teeth affected at once, or a pattern of repeated fractures over time, points towards a generalised dental or resorptive process rather than an isolated mechanical event.
A broken tooth after a road traffic incident, fall or fight is one part of a wider injury picture; faster or laboured breathing, pale gums, weakness or collapse in the hours afterwards point to injuries beyond the mouth.
Where the pet allows it without the mouth being held open, a close, well-lit photograph of the broken surface, including any pink, red, black or brown spot at its centre, gives useful documentation of the fracture type; a painful mouth raises the risk of a bite. Noting which side of the mouth the pet chews on, whether food is dropped, and whether the pet paws at its face helps build a picture of ongoing discomfort. Keeping a note of what was being chewed when the fracture occurred, and whether it has happened before, adds context on recurrence.
Last reviewed: 9 October 2026 · Dr Alastair Greenway MRCVS