As the function of the microbiota of the mouth becomes more understood, ancient techniques to support oral hygiene are becoming more popular. 
Tongue scraping is the simple practice of scraping your tongue before brushing your teeth. Studies have shown that this simple technique:
Reduces undesirable bacteria in the mouth that can compromise gum, teeth and oral health. 
Reduces volatile sulfur compounds (VSC), which are by-products of mouth bacteria linked to bad breath. 
Improves taste sensation and reduces tongue coating. 
Changes the environment of the mouth to reduce putrefaction and decrease bacterial load.