What causes it? According to the American Academy of Oral Medicine, a cracked tongue is known as a fissured tongue. The grooves are usually found on the middle third of the dorsal (top ...

READ MORE: Vitamin D: Signs you’ve taken too many vitamin D supplements - 'harmful' effects to spot Having either a yellow-looking tongue or one with a crack down the middle could indicate liver ...

READ MORE: Vitamin D: Signs you’ve taken too many vitamin D supplements - 'harmful' effects to spot Having either a yellow-looking tongue or one with a crack down the middle could indicate liver ...