be sure to scrape the tounge if you don't have a tounge scraper from the health shop
use a spoon. Keep it thouroughly clean though.
Also it is good to rinse and gargle with Hydrogen peroxide - see H202 forum for 5 mixes. Another good idea is to use Hyssop, Myrrhh and or Tea Tree Essential oil 102 drops in water and rinse withbthis 2-3 times daily.
All of theses are very anti bacterial. And there is a lot of bacteria in the white/yellow matter that the digestive tract starts to throw off once you are into the fast.