How IUDs prevent pregnancy (3D Animation)
Did you know that IUDs are over 99% effective at preventing pregnancy? An IUD is a tiny, T-shaped device that a doctor places in the uterus. There are two main types: hormonal and copper. Hormonal IUDs release a small amount of progestin, a hormone that thickens cervical mucus, thins the uterine lining, and sometimes stops ovulation.
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