Medical Definition of ODONTOLOGY. 1. : a science dealing with the teeth, their structure and development, and their diseases.2. : forensic odontology. â odonÂ·toÂ·logÂ·iÂ·cal \-Ëdaent-ËdÃ¤nt-Él-Ëaej-ËÃ¤j\ i. kÉl adjective. : a science dealing with the teeth, their structure and development, and their diseases. 2. : forensic odontology.
1 See a doctor if canker sores are accompanied by fever, last more than three weeks, or the affected individual has difficulty swallowing.  Multiple factors may cause canker sores, including injury to the mouth, acidic or spicy foods, vitamin deficiencies, hormones, stress, or autoimmune disorders.
What causes canker sores? It is poorly understood what exactly causes canker sores, and more than one cause is likely, even from person to person. A canker sore does not seem to come from viruses or bacteria. However, in some people, an allergy to a bacterium inside the mouth may trigger the onset of canker sores.