Doctors say a normal, healthy tongue should be pink, and if it’s not, it could be a deeper health problem. If your tongue is red, it might mean you’re deficient in folic acid or vitamin b-12.

Oral cancer is the eighth most common cancer in the world and has a five-year survival rate of about 50%. Between 5% and 15% of low-grade oral premalignant lesions progress to cancer. If they become ...