Not having had the problem, I hadn't looked into thrush until now. I was just looking around on some sites and learned a lot about it. I'm sure this site probably has a ton of info on it, but I'm sure you all already looked there, and I'm stuck inside today with not much to do anyway in this bone-chilling 60 degree weather.

Though we are at very high risk during and right after treatment, it seems the risk lessens as our immune systems recover. Many OC survivors suffer from problems with malnutrition which contributes to rhe risk. The mouth dryness is a factor, too. Maybe Biotene products can help there. Sugar, as Eileen mentioned, feeds the yeasy fungus, as do breads and other carbohydrates. And antibiotics kill the bacteria, etc, that keep it under control, so taking something to counteract that with them makes sense.
The sites I saw all recommended uncultured yogurt (yech), so if you can stomach it....
There's a lot more that I'm sure I'm forgetting in this post - I blame my rad/chemo brain memory - but that's a lot of it. It did say that HIV and cancer patients have the danger of it spreading down the esophogus and hitting organs, like the kidneys and liver, so treating it quickly when it does rear its ugly head would be very important.
Hope this helps some.
Lani