Merck Manual

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Facial swelling, dog
Facial swelling, dog

    A swelling or draining tract that is observed ventral to the medial canthus of the eye may be an indication of an endodontically compromised tooth. This is most commonly associated with the maxillary fourth premolar or first or second molar teeth. A thorough oral examination and radiographic imaging of the oral cavity should be considered.

Courtesy of Dr. Brenda Mulherin.