Answer:
The kinds of birth control that work the best to prevent pregnancy are the implant and IUDs — they're also the most convenient to use, and the most foolproof. Other birth control methods, like the pill, ring, patch, and shot, are also really good at preventing pregnancy if you use them perfectly.
Paragard is over 99% effective—more effective than any other hormone-free birth control method*—and most hormonal methods. In fact, the American College of Obstetricians and Gynecologists (ACOG) recommends Paragard as one of the most reliable ways of preventing pregnancy.