The Copper T is a highly effective, hormone-free intrauterine device (IUD). It works primarily by releasing a small, safe amount of copper into the uterus. This copper acts as a natural spermicide, stopping sperm from reaching and fertilising an egg. It also prevents a fertilised egg from implanting in the uterine lining. Depending on the specific model, a Copper T IUD can remain active and highly effective for up to 10 years. It is completely reversible, meaning your normal fertility returns immediately once a healthcare professional removes it.