Anybody with chronic, offensive BB already knows that tongue brushing has almost no impact on odor. Everybody has some coating on their tongues, and most people have a bit of build-up on the very back--due to sinus drainage and mucus-forming foods--that doesn't smell so good when scraped off and sniffed. BB sufferers can scrape ten, twenty times a day until the skin is about to be peeled off (some of us have gone this far) and still the BB will remain.