Your tongue has got something to tell, but this time you need to look at it rather than listen. Your tongue can tell a lot of things about your health.

Smooth tongue

     Normally, your tongue doesn't feel smooth, it feels fizzy and rough. If your tongue feels smooth, it could be a sign of nutritional deficiency. It could be sign of iron deficiency or deficiency in B vitamins, which are crucial for your body generating energy from the food.

Patches
     If you notice some patches on the tongue that may be changing their location everyday, it could be because of geographic tongue, a harmless but discomforting condition. Possible cause may include vitamin B deficiency and irritation by alcohol or certain foods.
Wrinkles
     Wrinkles on the tongue are a rare sight but if you see them, it could be a symptom of scrotal tongue. Scrotal tongue is an inborn condition that can cause wrinkles on the tongue along with burning sensation while eating spicy foods.
Black tongue 
     Black tongue caused by overgrowth of tongue papillae that can trap bacteria and other mouth debris posing risk of oral problems. Black tongue is usually a sign of poor oral hygiene or excessive use of tobacco or even mouthwash especially. You may also get a metallic taste from the black tongue.

Yellow tongue
     The overgrowth of papillae on the tongue can trap bacteria, making your tongue appear yellow. Yellow tongue is a sign of excessive smoking, fever, mouth-breathing, dehydration and poor oral hygiene. Improving oral hygiene can soon  resolve the coloring.

White tongue 
     White tongue is also a sign of bacteria stuck in dense tongue hair as the bacteria, dead cells and debris wedged in the papillae makes the tongue appear white. Improve your brushing and flossing habits, but most important thing is to add a tongue scraper to your oral hygiene routine.

Red tongue
     A red tongue can be one of the first symptoms of scarlet fever or kawasaki disease. Adults less often manifest these signs. But if your mouth hurts and your tongue looks smooth and red, your diet may be deficient in niacin, an important B vitamin.