Eating yoghurt may help keep yeast levels low throughout the body, but particularly in the stomach and intestines. Because candida in the bowel can easily make its way to the vulva and vagina, keeping your digestive system clear of thrush may help prevent vaginal thrush.

Inserting yoghurt into your vagina may also help restore your vaginal pH balance, but there is less scientific support for this method. If you want to give it a try, put one teaspoon of yoghurt in an applicator, a plastic syringe or on a tampon, and insert it high into your vagina. Repeat this every night for a week. It is important that you use only unsweetened, plain, live yoghurt.

The active ingredient in this treatment, lactobacillus acidophilus, is also available at health food stores as a supplement on its own.

Hope this is useful. For more ideas, check out this link. Good luck.

http://altmedicine.about.com/od/healthconditionsqtoz/a/yeast_infection.htm

You can also use garlic, but if you aren't wanting to put anything in your vagina, it might not be that helpful just floating around in your underwear.

Using a clove of garlic (you should probably tie a string to it) or even garlic powder (try rolling or dipping the end of a tampon in it) will work if you insert it into your vagina overnight. Works for me every time.

Wierd fact: After doing so, you may actually be able to 'taste' the garlic in your mouth. I don't know why, but I always can!