Scraping the tongue daily removes any build-up on the tongue, which, if left untreated, can lead to bad breath and may house a significant number of bacteria. 

In addition, from an Ayurvedic perspective, by removing this coating you improve your ability to taste your food, which makes it more satisfying. By increasing your taste reception, not only do you eat less, you also eliminate the need to add more sugar, salt, or excessive spice to the food to make it more flavorful.