Breast implants come in a variety of sizes

When choosing breast implants, size should be based on the dimensions of your native breast as well as the stretch of the soft tissue envelope. Certainly, both saline and silicone implants can be found in sizes as large as 800cc. However, the goal should be to provide a balanced look with the implant and the rest of your body habitus.  In addition, a large implant can cause permanent stretch to the local tissue, eventually leaving the breast looking droopy. Silicone implants tend to be lighter in weight than saline and exert less forces on the surrounding tissue. You should consult with the plastic surgeon who originally placed your implants.  They are in the best position to help you determine the appropriate size and implant type.