This is a big myth, and in fact, you are most likely already using silicone every day without knowing it!
Silicone is used in various medical devices such as artificial heart valves, joint replacements or medical tubing. You will also see silicone in baby pacifiers, baby bottle nipples, kitchen gear, and skin care items such as creams and makeup.
Specifically speaking about breast implants, silicone implants have been in use since the sixties, and technology has only improved since then. Even in the US market, the FDA deemed silicone implants as safe, reapproving use of them in 2006.