This is very common. Breast revision patients often choose a replacement implant that is a different size or made from different material. Some women decide that saline implants feel less natural than they expected, and swap saline for a silicone gel variety. Other women may have health or safety concerns about silicone gel implants, and choose saline for replacement breast implants. If you choose smaller implants, the area surrounding the new implant will need to be tightened, and skin may need to be lifted. An increase in breast size will require the surgical creation of a larger pocket to accommodate the bigger implant.