Please Clean Your Tongue..

The surface of your tongue is one of the breeding grounds of the bacteria that attack your teeth and gums.
The bacteria and fungi that grow on the tongue are related to many common oral care and general health problems. 
In addition, decaying bacteria produce volatile sulphur compounds on the rear of the tongue; these molecules are the main cause of halitosis, or bad breath. Fortunately, cleaning your tongue can make all the difference (that is, of course, if you also brush and floss twice a day). 

To clean your tongue, brush the entire surface with a clean toothbrush, applying light pressure from the back of the tongue to the front. Alternatively, take a good length of floss and wrap each end around your middle fingers. Apply downward pressure with your index fingers and drag the floss from the back to the front of your tongue several times. Rinse the floss in between scrapings. or you can use a tongue cleaner (also called a tongue scraper) is an oral hygiene device designed to clean the bacterial build-up, food debris, fungi, and dead cells from the surface of the tongue. Tongue cleaners lift and remove these materials from the tongue surface. The tongue cleaner should be used before using tooth brush in the morning, and not after.

Source from here