The use of copper ions in the uterus is a contraceptive technique that has been tried and tested for decades. The intrauterine ball itself has not been on the market for very long, however, it is assumed that its contraceptive safety is at around 99%, with a Pearl Index of 0.3 to 0.8. This is the same effectiveness as a correctly taken birth control pill.

Furthermore, once you have the intrauterine ball fitted, you do not need to remember to take a contraceptive for 5 years – because once the IUB has been fitted, it does its job all by itself.