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Myth: Wearing antiperspirant increases your risk of getting breast cancer.

Reality: The American Cancer Society pooh-poohs this rumor, but admits that more research is needed. One small study did stumble on traces of parabens in a tiny sample of breast cancer tumors.

Parabens, used as preservatives in some antiperspirants, have weak estrogen-like properties, but the study in question made no cause-and-effect connection between parabens and breast cancer, nor did it conclusively identify the source of the parabens found in tumors.

Next: Myth: Small-breasted women have less chance of getting breast cancer.