You want to be sure that your symptoms are actually due to yeast and not a sexually transmitted disease. Sometimes yeast infections can be stubborn, and over-the counter creams don't work. Keep clean, washing daily with a mild soap and water. Avoid using perfumed powders, sprays or deodorants on your vagina. Cut down on sugar in your diet.
Some women find that eating yogurt with active cultures helps prevent yeast infections.
Be careful not to contaminate your vagina with bacteria from your anus. Avoid tight clothes that prevent your vagina from breathing. Wear clean, cotton underwear and avoid thongs that might irritate your vagina. Also use contraceptive or spermicidal jelly or foam. Be smart about your sex life.