Some of the common reasons for canker sore include Food sensitivities or allergies (anything from highly acidic foods to chocolate and coffee), a diet low in B12, zinc, folate (folic acid), or iron or Toothpaste containing sodium lauryl sulfate. Other reasons involve Hormones, Emotional stress, Smoking, oral cancer, or Gastrointestinal tract diseases. In the meantime, certain drugs like Aspirin, Nonsteroidal anti-inflammatory drugs (NSAIDs), Beta-blockers, Oral nicotine can also cause the problem.At Shops.ae you get access to top global brands like Colgate, Periodontal, Chico, Dentek, and Orajel. So you can easily find all that you need for your mouth and health and beauty.