The diaphragm is a silicone dome-shaped cup that covers the cervix to keep sperm out of the uterus. Spermicide, a substance containing chemicals to slow sperm down and prevent it from reaching an egg, is used with the diaphragm for additional protection.

How effective is it against pregnancy?
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More info: How Do I Use a Diaphragm?

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A diaphragm is a shallow, dome-shaped cup made of silicone.
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