B12 And Canker Sores---What causes canker sores?: Does a Lack of Vitamin B12 Cause Canker Sores?; Painful canker sores are often blamed on sodium lauryl sulfate (SLS) by marketers of natural or organic toothpastes; in reality, vitamin B12 deficiencies are an identified cause of a painful tongue canker, canker sore, oral ulcer or other throbbing mouth sores.
Understanding Canker Sores
Canker sores are actually open sores located on the gums, tongue and other oral mucous membranes. Canker sores are painful, last about two to four weeks and oftentimes force the sufferer to alter his food intake to prevent additional pain.