Let us say that you want it to look obvious that you underwent breast augmentation surgery, but you do not want to use silicone implants. The options you can have to make your breast look natural are dependent on your breast base, how wide your breasts are, and the implant profile. Saline implants have the advantage to add more volume than the minimal volume recommended. For the most part, breast manufacturers allow and recommend a certain range of volume to be added to a breast implant. For example, a 330 cc Mentor implant can actually go all the way to 400 cc without compromising the warranty of the implant. The more volume put on a saline implant, the fuller your breasts are going to look at the top. This is due the fact that the implant has a standard width. Based on the dimensions and physics, adding more volume to a saline implant will essentially stretch it in an anterior direction, both at the top and the bottom. It does not tend to increase to the side, so the more volume you put, the fuller your breast becomes at the top, making it look more unnatural. Regardless of the body profile, the breast will certainly end up looking unnatural once a standard saline implant is filled to its maximum capacity.