
Using harsh mouthwashes or oral products that can damage the outermost layering of the mouth can also lead to canker sores. Also, many people suffer from injuries from dental equipment such as braces. Since the sores are actually tiny ulcers, they can be caused by any kind of hard brushing or eating something that can cause bruises or lead to tissue inflammation in the mouth. Stress on the tissues or any type of injury in the mouth can cause canker sores. Healthy eating is the best solution to such a nutritional deficiency. Deficiencies of calcium can also cause canker sores, but more than causing them, calcium deficiency can worsen the situation. It has been noted in several studies that canker sores are either caused or triggered further when there is a deficiency of folic acid, zinc, or iron in the human body. If this is the cause of canker sores, then taking vitamin capsules or applying the contents of vitamin B-12 capsules directly to areas where sores have developed can offer quick and painless results. Thus, vitamin B-12 deficiency is rather common among kids. Fruits and vegetables are not typically a dear favorite of the young guns. Also, kids are the most averse to vitamins. Kids require more vitamins than adults because they are consistently growing and the body keeps demanding more vitamins. In case of canker sores, the specific vitamin is B-12. Most problems of the skin and outermost layers of the human body in areas such as the inside of the mouth are owing to vitamin deficiencies. While there can be some rare factors for an individual, these five reasons are the most common and widespread causes of canker sores. There are many arguments and speculations. Unlike most other dental or oral problems, canker sores do not have a surefire specific cause.

Scientifically, there is still an open and unsettled debate as to what precisely causes canker sores. Complex canker sores are rare but people with a history of simple canker sores are prone to them.

Although simple canker sores are mostly common in the age group of 10 to 20, complex canker sores can happen at any age. Canker sores can happen to anyone, at any age.
