It's the muscle we use every day for speaking, swallowing and tasting. But our tongue could also be an important indicator of our health and provide clues about what's going on within our body.

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 ...