Tongue Brushing or Scraping?

Tongue cleaning is recommended by ADA to remove oral bacteria collected in the back of the tongue that contributes to halitosis.  The tongue has millions of tastes of buds that trap debris and bacteria so it is important to keep it clean daily! 
Tongue cleaning with a toothbrush is one way to clean the tongue but the height of the toothbrush head may restrict reaching all the way to the back of the tongue.  A tongue scraper has a low profile head with ridges allowing to scrape the length of the tongue in three or four overlapping strokes to clear debris and plaque.  

Effectiveness of mechanical tongue cleaning on breath odor and tongue coating. International Journal of Dental Hygiene. 2010
Tongue brushing or scraping reduce halitosis!

The comparative evaluation of the effects of tongue cleaning on salivary levels of mutans streptococci in children. International Journal of Dental Hygiene. 2012
This study showed that the tongue brushing and scraping demonstrated significant reduction in salivary mutans streptococci.