Hi. To appropriately discuss implant size and choice, you really need an in person evaluation by a plastic surgeon with good experience with breast augmentation. Opinions and preferences will vary somewhat from one surgeon to another surgeon. Personally I start with the base width of the patient as the starting point for the footprint of the future implant. Tissue characteristics, and desired postoperative size, and patient anatomy all factor in to the proper selection of implant volume as well as profile. I go over all of that all in detail with my patients at the time of their consultation. Breast implants can come in a variety of shapes, sizes, texturing, and materials. For someone new to this, it can seem overwhelming. So, as a plastic surgeon, I want to be able to make that a reasonably clear process for my patients and for them to understand their options and make a well informed decision that his right for them specifically. Currently, my "go to" implant is a smooth round device, which may be silicone gel, or saline. Within the silicone gel implant family there are various options as well, mainly with different levels of how cohesive a silicone gel implant is, but also with the shape of the implant. My most commonly used silicone gel implant is one and that is smooth and round with a cohesive level that has a great balance of being cohesive but also being very nice and soft and natural. Personally, I will place a silicone gel implant either above or below the muscle, depending on multiple factors which I discuss during my consultation with my patient. The more cohesive the implant is, be more that it keeps it shape, but that comes with the implant being slightly more firm. When people refer to a "gummy bear" implant, most people are referring to a teardrop-shaped (anatomic-type shape) silicone gel implant, that is the most cohesive so that it keeps its shape. This may also be referred to as a "form stable" silicone gel implant. It is typically textured to try to help that implant stay in the proper position. That implant can have its advantages in terms of making the upper portion of the breast have a more naturally full slope. Some patients prefer that, while other patients prefer more fullness in the upper portion of the breast, such as what you more typically get with a round implant. In a similar fashion, some patients are okay with the slightly more firm feel that you get with a form stable implant, and others prefer an implant that is softer and more natural. Currently, with some of the controversy surrounding textured breast implants, I am pretty much only using smooth round breast implants. A saline implant can also be a good option. This is typically more straightforward from a monitoring standpoint, in terms of whether the implant is leaking or not, but it does not tend to feel quite as natural. Because of that, I put almost all of my saline implants under the muscle, in what is referred to as a "dual-plane" position to help camouflage the implant. For a saline implant, I pretty much only use a smooth, round device. I recommend consulting with a board certified plastic surgeon who has good experience with breast augmentation and even breast augmentation revision, so that you and your surgeon can come up with a plan specific for you. Choosing the right plastic surgeon, with good experience and good outcomes and who communicates well with you regarding your desired result is obviously extremely important in achieving your goals. Good luck and take care,Dr. Howell