Breast Implant Types: Silicone, Saline, and Gummy Bear
Key takeaways
- The two fills are silicone gel and saline; cohesive 'gummy bear' implants are a firmer form of silicone gel that holds its shape.
- Silicone gel feels more like natural tissue and is the most common choice; saline is filled with sterile salt water and tends to ripple more.
- A saline rupture deflates noticeably as the body absorbs the salt water, while a silicone rupture is often 'silent' and found on imaging.
- Implants come with a smooth or textured surface; the rare cancer BIA-ALCL is linked mainly to textured implants.
- Implants are not lifetime devices, whichever type you choose, so plan for the likelihood of future surgery.
There are two breast implant fills, silicone gel and saline, with cohesive “gummy bear” implants being a firmer, shape-holding form of silicone gel. Each fill also comes with a smooth or textured surface. When I was deciding, the names blurred together; what actually mattered was how each one feels, how each behaves if it fails, and which surface carries which risk. Here is the honest version.
I remember sitting with the sample implants in my lap, squeezing each one and trying to picture it as part of me. That moment is when the differences below stopped being words and started being a real choice.
Silicone gel implants
Silicone gel implants are filled with a soft, cohesive gel and are the most common choice because they feel more like natural breast tissue. This is the implant fill most people picture. The gel moves with you, which is why so many people prefer it for a natural feel. How natural it ends up feeling also depends on how much of your own tissue covers it, so the implant is only part of the story.
The main trade-off is monitoring. Because the gel is cohesive and tends to stay put if the shell fails, a silicone rupture is often silent, with no obvious change. The FDA notes this and discusses imaging to screen for silent rupture, so silicone is not a fit-and-forget device.
Saline implants
Saline implants are filled with sterile salt water and tend to feel slightly firmer, with more visible rippling than silicone. The shell is silicone, but the fill is salt water, often added after the implant is placed so it can go in through a smaller incision. They are a long-used, well-understood option.
The rippling matters most for slim people with little natural tissue to cover the implant, where the edges can show or be felt. The upside is failure is obvious: if a saline implant ruptures it deflates noticeably as your body harmlessly absorbs the salt water, so you know quickly. The NHS lists saline alongside silicone as a standard fill for breast enlargement.
Cohesive “gummy bear” implants
Gummy bear is the nickname for highly cohesive, form-stable silicone gel that holds its shape like a gummy sweet holds its shape when cut. The thicker gel resists rippling and keeps its form well, and many gummy bear implants are shaped (teardrop) rather than round to mimic a natural slope.
The trade-off is feel: a form-stable implant is firmer to the touch than soft silicone gel, so the softness many people want is a genuine compromise. Shaped implants also need to stay correctly oriented, which is one reason surface texture, covered below, comes into the conversation. Whichever gel you choose, it is still silicone, so the same imaging point applies.
Smooth versus textured surface
Implants come with a smooth or textured outer shell, and the rare cancer BIA-ALCL is linked mainly to textured implants. Texturing was developed to help shaped implants stay in position and may reduce some capsular contracture, the scar tissue tightening that is a common complication.
BIA-ALCL is a rare cancer of the immune system, mainly associated with textured surfaces; the FDA treats it as an established, if uncommon, risk and has acted on certain textured devices. Smooth implants move more freely and are not associated with BIA-ALCL in the same way. This is exactly the kind of trade-off to put to your surgeon directly.
How each behaves on rupture
On rupture, saline deflates visibly while silicone is often silent, and this difference shapes how you monitor each one. With saline, the salt water is absorbed harmlessly and the change in shape is your warning sign. With silicone, the cohesive gel usually stays within the scar capsule, so there may be no outward sign at all.
That is why the FDA discusses imaging to screen for silent rupture of silicone implants over time. It is worth remembering that implants are not lifetime devices: many people need further surgery over the years, so rupture is a known risk to plan for, not a remote one.
How to choose
Choose based on the feel you want, the rippling risk for your tissue, the surface trade-offs, and how each type fails, all weighed with a qualified plastic surgeon. Feel, shape, and the right implant size are decided together, by volume (cc) and profile, for your frame and tissue rather than a cup size alone.
For me, holding the samples made the soft-versus-firm difference real in a way no leaflet did. Take the trade-offs into the room, ask about BIA-ALCL and silent rupture by name, and let the surgeon match the implant to your body. The wider picture is in the breast augmentation overview.
This guide is general information and one patient’s experience, reviewed by a consultant plastic surgeon. It is not a substitute for a consultation with a qualified plastic surgeon who can assess you.
References
- Breast Implants, U.S. Food and Drug Administration.
- Breast Augmentation, American Society of Plastic Surgeons.
- Breast enlargement (implants), NHS.
Frequently asked questions
What are the main types of breast implants?
There are two implant fills: silicone gel and saline. Cohesive or 'gummy bear' implants are a firmer, more form-stable version of silicone gel that holds its shape. Each fill comes in a smooth or textured surface, and in a range of volumes (cc) and profiles. You choose the fill, surface, and size with your surgeon based on your frame, your tissue, and your goals, not a bra cup size alone.
What is the difference between silicone and saline implants?
Silicone gel implants are filled with a soft cohesive gel and tend to feel more like natural breast tissue, which is why they are the most common choice. Saline implants are filled with sterile salt water; they can feel slightly firmer and are more prone to visible rippling, especially in slim people with little natural tissue. They also behave very differently if they fail: saline deflates noticeably, while silicone failure is often silent.
What are gummy bear implants?
Gummy bear is the nickname for highly cohesive, form-stable silicone gel implants. The gel is thicker and holds its shape, much like a gummy sweet holds its shape when cut. They keep their form well and resist rippling, and many are shaped (teardrop) rather than round. They are firmer to the touch than standard silicone gel, so the natural softness you want is a genuine trade-off to discuss with your surgeon.
What happens when a breast implant ruptures?
It depends on the fill. A saline rupture is usually obvious: the shell leaks, the implant deflates over hours or days, and the body harmlessly absorbs the salt water. A silicone rupture is often 'silent' with no outward sign, because the cohesive gel tends to stay within the scar capsule. For this reason the FDA suggests imaging to screen for silent rupture of silicone implants. Implants are not lifetime devices, so rupture is a risk to plan for.
Are textured or smooth implants safer?
Both surfaces are in use, but they carry different considerations. BIA-ALCL, a rare cancer of the immune system, is linked mainly to textured implants, so this is a key point to raise in your consultation. Textured surfaces were designed to help shaped implants stay in position and may reduce some capsular contracture. Smooth implants move more freely and are not associated with BIA-ALCL in the same way. Your surgeon will explain the current evidence.
Which type of breast implant feels the most natural?
Soft silicone gel is generally felt to be the closest to natural breast tissue, with saline feeling slightly firmer and more prone to rippling. Cohesive gummy bear implants hold their shape well but are firmer to the touch. How natural any implant feels also depends heavily on how much of your own tissue covers it and whether it sits over or under the muscle, so feel is not down to the implant alone.
Written by Claire Ashley. Medically reviewed by Miss Charlotte Vane, MBBS, FRCS(Plast).
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