Definitions for "Canker sore"
Keywords:  ulcer, sore, shallow, halo, tongue
painful ulcer on the mucous membrane of the mouth; it may result from an autoimmune response
A type of mouth ulcer often caused by viral infection. Usually self limiting and resolve within fourteen days.
Mouth sore appearing whitish, often with a red halo. They typically last 10 to 14 days. If this is a chronic problem, consider swithching toothpastes to a non-foaming brand such as Biotene®. Also, your dentist can treat them with Debactoral®, which is extremely effective for most individuals.
Keywords:  deficiency, vitamin, early, sign
an early sign of Vitamin C deficiency