Originally posted on APRIL 17, 2014

Recent studies in Dentistry have identified a few possible reasons why people may get a canker sore. Although these are not “definitive” reasons, they are rather suggestions that we may look to see if they happen to reflect any patterns in our lives.

Canker sores generally affect kids in the age range from 10 – 20 years of age. However, complex canker sore can be found at any age. It should be noted that complex canker sores are quite rare.

The following are the most common causes of canker sores.


Most common problems to the skin and the areas inside the mouth are a cause of vitamin deficiencies, specifically B-12. Kids are most likely to get canker sores and are also most likely to lack the B-12 vitamin. This is because they are constantly growing, and the body is therefore constantly demanding vitamins. Fruits and vegetables are simple items that can contain B-12 but are generally not on the top of kids favourite foods. And, since kids may not eat enough of these, they may not take in enough B-12. There are solutions to this possibility, so please have talk with any of the Dental Professionals at Southend Dental, or your family physician to discuss options.


In studies it was noted that canker sores are either caused by, or triggered by, a lack of folic acid, zinc, or iron. Deficiencies of calcium were also noted, however, the calcium deficiency was more clearly linked to aggravating the situation. Healthy eating, again can certainly aid in the fight against canker sores.


Stress on the tissue, or any type of injury to the mouth can cause canker sores. Since canker sores are a form of ulcer, they can be caused by hard brushing, eating something, or any type of injury to the mouth that can lead to bruising or tissue inflamation. Braces, harsh mouthwashes, and other oral products (over the counter dental tools), can damage the outer most layer of the mouth resulting in a canker sore. So, please be careful, and again speak with your Dental Professional about any products you may be will to try.


Seems odd to bring up fruits and vegetables as a “cause” of canker sores. Many fruits or vegetables that are high in citrus or have a high acidity content can aggravate a canker that ALREADY exists. Although it can not be said that oranges, pinapples, or lemons, cause a canker sore, they can delay the recovery of one.


It has not been determined that a poor immune system causes canker sores, as it is difficult to find a difinitive correlation between and individual’s immune systems and canker sores. However, poor immune systems cannot prevent canker sores and can delay in the recovery of canker sores. The only direct correlation was that those with weak immune systems may have a longer recovery period, dispite all possible preventative action taken.

We hope you find this informative and this may answer some of you questions as to why do I get canker sores and seemingly no one else does. Again if you have any questions please ask any one of the Southend Dental Team.