Breast Implants.
By inserting an implant behind each breast, surgeons are able to increase a woman's bustline by one or more bra cup sizes. A breast implant is a silicone shell filled with either silicone gel or a saltwater solution known as saline.

Because of safety concerns regarding silicone gel-filled breast implants, the Food & Drug Administration (FDA) has determined that new gel-filled implants, at the present time, should be available only to women participating in approved studies.

Saline-filled implants are currently available to breast augmentation patients, pending further FDA review. You should ask your doctor more about the specifics of the FDA decisions.