Tongue scraping or brushing can be advantageous for removing unhealthy bacteria that build up on the tongue.

“I looked pretty extensively into this issue of tongue scraping and it's an interesting one and every licensed dental health care professional I spoke to in preparing for this episode agreed that yes it can be a good idea to scrape the tongue and each one of them cited the fact that a number of unhealthy bacteria can build up on the tongue across the course of the day and throughout the night much in the same way that biofilm can build up on teeth although through a different process different bacteria and that scraping the tongue or brushing the tongue can be advantageous for removing that bacteria”