Mouth ulcers signs they could be more serious and when to see a GP Express.co.uk Canker Sores Causes, Treatment, Remedies, Symptoms & Signs Electronic cigarette explosions involving the oral cavity The Journal of the American Dental Association 17 Mouth & Tongue Problems: Pictures of Sores, Blisters, Bumps, and More E cigarettes found to cause change in mouth bacteria which could lead to gum disease or oral cancer