In general with modern silicone breast implants the devices last for decades, unless there is a manufacturing fault such as with the PIP implants of major trauma to the breast implant air bubble. The surrounding tissue may thicken as in a capsule contracture or the breast may sag. Often events that make the breast change size abruptly like weight fluctuation or pregnancies stretch the breast and alter the result. Surgical revisions are most often performed for these reasons, not because of a problem with the implants theselves. The rupture rate slightly increases breast implant air bubble the age of the implants increase.