Tongue Scraping: What Is It And Should I Be Doing It?
Although tongue scraping, or jihwa prakshalana, is an ayurvedic self-care ritual dating back many centuries, there are more recent historical examples of this custom in Western cultures as well. Between the 15th and 19th centuries, affluent Europeans were known to use instruments to clean their tongues, but the practice was limited to the upper class.
Article source: https://www.huffpost.com/entry/what-is-tongue-scraping_l_620c8237e4b0557b5a3c5610