Canker Sores or Apthous Ulcers, are a common type of mouth ulcer that shows as a painful open sore on the inner surface of the cheeks and lips, tongue, soft palate, and the base of the gums. They appear as having a white or yellow center surrounded by a bright red area and tend to last 10-14 days. They are a common problem and have no long term effect on our health. They are not cancerous and the…