In Ayurveda, the tongue can signal many different health ailments. Scraping the tongue each morning upon waking removes toxins from undigested food. A white coating of toxins coming from the intestines can build up on the back of the tongue. If it is not scraped away, you can re-digest these toxins. Tongue Scraping can be helpful for bad breath, digestion and boosting immunity! Best used directly after waking and followed by oil pulling.