The tongue is a highly vascular fleshy organ which gives a place for bacteria to grow. These bacteria include gram-positive and gram-negative bacterial groups. To your surprise, not all the bacteria are bad.
A healthy tongue is pink in color with the papillae covering the surface of the tongue. If you are suffering from a painful tongue or altered tongue color, then it is the point of concern. Visit a doctor in such condition.
When you are having a bad breath then check if your tongue is white. Bad breath is often related to the white tongue. Your white tongue indicates that food debris, bacteria, and dead cells have been trapped between enlarged papillae.