The mouth ulcers also commonly called canker sores are painful that appear in the mouth often in groups of two or three or even alone. These small ulcers tend to erode the surrounding parts. They are usually white with a red border and are formed inside the lips or cheeks. They cause a sensation of burning or tingling, especially eating spicy food or acid. The ulcer may also be the result of an injury with a toothbrush. Normally, healing requires one to two weeks, and longer if the wound is very large. For many people, the appearance of mouth ulcers is recurrent. In fact, it is a very common problem that affects 20 percent of the population. Some factors supporting their apparition are reactions to certain foods, stress or / and a nutritional deficiency. They are also called "ulcers mouth disease." They are often confused with cold sores (cold sore), but they are different; they appear on the lips and are linked to the herpes virus. Several deficiencies in vitamins and minerals can lead to mouth ulcers. The cells of the mouth occur every one to four days, so they require a constant supply of nutrients. The most notable deficiencies are certainly iron, zinc, vitamin B12 and folic acid. Another issue is food allergy. The highly acidic fruits and sweets, especially chocolate are also involved.