The anatomical link
The roots of the upper canines (and of the other upper teeth) lie close to the eye socket and the maxillary sinus. Infection can spread from the root into the soft tissues — hence the swelling under the eye.
You can see how the roots of the upper teeth, the nerves and the blood vessels sit below the eye on a diagram in How a dog’s and cat’s mouth works.
What to look out for
Swelling under the eye or on the face on one side. Discharge from the nose on the same side. Bad breath. Darkening of the canine on the same side. The animal may avoid chewing.
Diagnosis
Dental radiography is the key step. I assess the tooth, the root and the bone. Antibiotics without treating the tooth do not solve the problem in the long term.
Treatment
Root canal treatment or extraction of the affected tooth — it depends on the diagnostics. The aim is to remove the source of the infection.
Why an animal may keep eating with an abscess
Until the acute phase, the animal may keep eating. The owner notices only the “swelling” and does not connect it with the tooth. Early examination helps prevent progression.
What to do
Do not put it off. Do not treat with antibiotics alone. Book a dental examination. If the pet is lethargic or refuses food — urgently.
When to see a vet
- Swelling under the eye or on the face has appeared or is getting bigger
- There are other tooth problems nearby — a smell, a darkened canine
- The pet is lethargic, not eating, or has a raised temperature
- Discharge from the nose on one side
- Swelling appeared after an injury to the canine
- Antibiotics have not helped — the tooth needs assessing
- One-sided swelling — a dental cause is common
- Bleeding from the mouth on the same side
What not to do at home
- Do not treat only the “eyes” or the “nose” without examining the teeth
- Do not give antibiotics without a plan to treat the tooth
- Do not delay the visit — an abscess can progress
- Do not lance the swelling yourself
- Do not give human anti-inflammatory medicines
Frequently asked questions
Not always, but a dental cause is common with one-sided swelling. I will carry out the diagnostics.
They can reduce the symptoms temporarily, but without treating the tooth the infection often comes back.
Yes, they are essential to identify the affected tooth.
Yes, a swollen face is a reason for a prompt examination.
Yes, in dogs and cats alike — the mechanism is similar.
Sources and professional guidelines
- WSAVA Global Dental GuidelinesGlobal guidelines for veterinary dentistry
- AAHA Dental Care Guidelines for Dogs and CatsClinical guidelines for dental care
- EVDC / EVDS educational materialsEuropean professional materials on veterinary dentistry
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