Birth Control... how do I address the issue with women who see nothing wrong with it?

My daughter just turned 16 and I imagine the topic is going to come up soon. Every woman in her life see it as a good thing. How, as her father, do I express my concerns without coming across as a mysoginistic pig?

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I should make it clear... I'm referring to the pill. Or other hormone altering forms of birth control.
Birth Control... how do I address the issue with women who see nothing wrong with it?
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