My dentist has always told me that when I brush my teeth to always also brush my whole tongue, especially as far back into the throat as possible to prevent bacterial and fungal growth. I would think that if the growth has already set in, then these remedies and tongue scraping treatment would be better.
On one of the conference calls, Arun was saying that he recommends gargling with vinegar. Bacteria cannot grow well in such an acidic environment. However, do make sure that you wipe the vinegar off your teeth because it can hurt your teeth if it is exposed to vinegar for a while.