By Dr. Laura Kearney Canker sores, also known as Aphthous Ulcers, are the most common mouth ulcer and are seen in my dentist office frequently. The cause of canker sores is unknown yet there are many factors related to why we get them: Trauma of the mouth or stress can cause canker sores. For example, if you are eating something and it scrapes the inside of your mouth, this has the potential to turn into… Read more »