Symptoms :
Pain sensitive swelling next to the maxillary bone just below the eye. This infection can break through the skin as discharging sore. Often the eye if inflamed too.

Causes :
The dog has broken off a piece of a molar by biting down on a hard bone or a piece of wood or metal.

Effects :
An infection enters the root canal through the break in the tooth

The vet takes an X-ray to find out which root is affected. Depending on the recommendations of the vet, the tooth may be extracted or root canal may be performed.

Follow up care :
To prevent the infection from spreading into the jaw, antibiotics in tablet form have to be given for at least a week.

Prevention :
Train the dog not to chew on stones and metal.