By Kristine Gill, June 24, 2022

“It’s a T-shaped device that fits inside the uterus and basically serves to stop sperm from reaching and fertilizing the eggs,” says Dr. Kecia Gaither, Director of Perinatal Services for NYC Health and Hospitals/Lincoln in the Bronx. “With copper IUDs, the sperm just don’t like that because it impedes their motility. The hormonal [IUD] basically delays ovulation and makes the cervical mucus thicken, which provides a hostile environment to sperm.” 

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