Choosing Breast Implants

Choosing a breast implant is one of the most consequential decisions in the whole journey, and it is far more involved than picking a cup size from a brochure. In reality it is a series of linked decisions — type, shape, profile, volume and placement — that a good surgeon makes with you, based on precise measurements of your body and a clear understanding of the result you want. Getting these decisions right is what produces a natural, proportionate result that also ages well and minimises complications.

The five linked decisions

1. Type and fill

The first decision is what the implant is filled with. In the UK the usual choice is cohesive silicone gel, which feels the most natural and holds its shape. Saline and structured saline are used far less often. Gel itself ranges from softer cohesive gels prioritising feel to highly cohesive "gummy bear" gels prioritising shape control.

2. Shape

Implants come in round, anatomical (teardrop) and ergonomic designs. Round implants add fullness across the breast including the upper pole; anatomical implants mimic the natural slope with more volume low down. Modern practice often achieves natural results with round implants in appropriate placement, but anatomical implants retain clear roles, particularly in slim patients and reconstruction. See round vs anatomical.

3. Profile (projection)

Profile describes how far an implant projects forward relative to its base width — from moderate (wider, flatter) through moderate-plus and high to extra-high (narrower, more projecting). The same volume can look subtle or dramatic depending on profile. See projection explained.

4. Size (volume)

Volume is measured in cubic centimetres (cc), but cc does not translate neatly into a bra cup — that depends on your frame, tissue and the implant's width and profile. This is why surgeons start from measurements, not a target cup. See sizes explained.

5. Placement

Finally, where the implant sits — over, under, dual-plane or subfascial — affects cover, naturalness, recovery and animation. See which plane is best.

What your surgeon measures

A careful assessment is the foundation of a good choice. Your surgeon will measure and consider:

• Breast and chest base width — arguably the single most important measurement, which sets the range of implants that will fit naturally.
• Existing breast tissue and skin quality — how much natural cover you have, and how much the skin will stretch.
• Nipple position and any sagging — which may indicate a need for a lift rather than implants alone.
• Existing asymmetry — almost everyone has some, and it may mean different implants on each side.
• Your proportions, lifestyle and goals — an athlete who heavily uses the chest muscle, for example, may weigh placement differently.

Tools that help you decide

Several tools can bridge the gap between a number and a look:

• Sizers worn inside a bra let you see the approximate effect of different volumes on your own body.
• 3D imaging simulations can illustrate a likely outcome, though they are a guide, not a guarantee.
• Before-and-after photos of patients with a similar starting point are more useful than images of very different bodies. See how to read before-and-afters.
• Reference photos of looks you like — and dislike — help you communicate clearly.

Thinking long term

The best choice is one that looks good now and ages well. Larger, heavier implants can accelerate sagging, stretch and thin the tissues, and make rippling more likely over time. A size and profile matched to your tissue tends to give a more durable result; lightweight implants are one option for larger volumes. It is also worth remembering that implants are not lifetime devices, so factor possible future surgery into your planning.

Common mistakes to avoid

• Fixating on a single cc number instead of how the implant fits your frame.
• Choosing purely to match a friend's result, ignoring different anatomy.
• Letting "going bigger" override what suits your tissue.
• Underestimating the importance of placement and width.

Frequently asked questions