Silicone vs Saline Implants: What the FDA Data Shows

Both kinds of breast implants have a silicone outer shell. The difference is the fill: saline implants hold sterile salt water, and silicone implants hold silicone gel. The FDA approves saline implants for cosmetic breast augmentation from age 18 and silicone implants from age 22. The biggest practical difference is rupture: a saline leak shows up quickly, while most silicone leaks are "silent," so the FDA recommends regular imaging.

Silicone vs saline at a glance

Sources: FDA, ASPS, FDA labeling guidance.

What is the same for both

Many people expect one type to be "the safe one." The FDA's risk list does not work that way. For both types, the most common problems are capsular contracture (scar tissue tightening around the implant), reoperation and implant removal. Other common problems include rupture or deflation, wrinkling, uneven breasts, scarring, pain and infection (FDA).

The FDA also says breast implants are not lifetime devices. The longer you have them, the more likely you are to need surgery to remove or replace them. Since 2021, every U.S. patient must be offered a patient decision checklist before surgery, and the surgeon signs it too (FDA).

Two rarer risks also apply to both types:

• BIA-ALCL, a lymphoma (cancer of the immune system) that grows in the scar tissue or fluid around the implant. The FDA says the risk is higher with textured implants than smooth ones. It says the type of fill does not appear to be a risk factor, though no large study has tested this (FDA).
• Systemic symptoms sometimes called "breast implant illness," such as tiredness, joint pain or "brain fog." The FDA says these are poorly understood and have been reported with both saline and silicone implants (FDA).

So texture (smooth or textured) can matter more for some risks than the fill does. Ask your surgeon which surface they plan to use and why.

How they look and feel

The American Society of Plastic Surgeons (ASPS) says silicone gel "feels a bit more like natural breast tissue," while saline gives a uniform shape and firmness. The NHS says silicone implants are less likely to wrinkle, and saline implants are more likely to fold. How much rippling you see also depends on how much of your own tissue covers the implant.

Patient-reported data are limited. One U.S. survey of women who had reconstruction after cancer found higher satisfaction scores with silicone than with saline (Plastic and Reconstructive Surgery, 2010). That was a small survey of 143 women, and cosmetic patients may differ, so treat it as a hint rather than proof.

Rupture: the biggest practical difference

Saline

If a saline implant leaks, the salt water is absorbed by the body and the breast loses size and shape, often within days (FDA). You will usually notice it yourself. In Allergan's 10-year study of its saline implants, 90% of implants were still intact at 10 years (Aesthetic Surgery Journal, 2009).

Silicone

Most silicone ruptures cause no symptoms. The FDA calls these "silent ruptures." The gel usually stays inside the scar capsule around the implant, but it can move beyond it (FDA). In Allergan's 10-year silicone study, about one-third of women had scheduled MRI scans. In that group, 13% of women (7.7% of implants) had a rupture by 10 years (Plastic and Reconstructive Surgery, 2014). Both 10-year studies were funded by the manufacturer.

Because ruptures are silent, the FDA's labeling guidance says that, even with no symptoms, you should have your first ultrasound or MRI 5 to 6 years after surgery, then every 2 to 3 years. If you have symptoms or an unclear ultrasound, an MRI is recommended. Saline implants have no screening schedule because a rupture shows without it (FDA labeling guidance). The FDA warns these scans may not be covered by insurance (FDA). Budget for them over the life of the implant.

Capsular contracture: is one type worse?

Nobody has shown that clearly. A systematic review set out to test whether silicone causes more contracture than saline in cosmetic patients. It found too little good comparative data to say either way (Plastic and Reconstructive Surgery, 2010). Placement, bleeding after surgery and implant surface have stronger evidence as risk factors. Our separate guide to capsular contracture covers this in more detail.

Mammograms with either implant

You still need breast cancer screening. Tell the technologist you have implants. X-rays cannot pass through implants, so extra views may be needed to see as much breast tissue as possible (NHS). FDA patient labeling notes that all implants can interfere with mammography and breast exams, and that compression during a mammogram can cause a rupture (FDA labeling guidance).

Things the implant type does not decide

Several choices shape your result as much as the fill does. Talk them through with your surgeon:

• Placement. The implant can sit under the chest muscle or on top of it, behind the breast tissue (ASPS). In the Allergan silicone study, contracture was less common under the muscle (15.7%) than over it (26.3%) (Plastic and Reconstructive Surgery, 2014).
• Incision. Common sites are the edge of the areola, the fold under the breast and the armpit. ASPS notes that a belly-button approach has a higher complication rate (ASPS).
• Sagging. An implant of either type does not fix severely drooping breasts. A lift may be needed as well (ASPS). Our article on breast lift vs breast augmentation explains how surgeons decide.

Which is better for you?

There is no single right answer. These points often decide it:

• Age. If you are 18 to 21, only saline is FDA-approved for cosmetic augmentation in the U.S.
• Feel and tissue cover. If you are slim with little breast tissue, ask how visible rippling might be with each type.
• Follow-up you can keep up. Silicone means imaging every few years for as long as you have the implants.
• Cost over time. Prices differ by type and country. See our breast augmentation cost guide for U.S. figures, and add the cost of future scans.

Bring these questions, and the ones in our checklist for plastic surgeon consultations, to your appointment.

If you have surgery abroad

Your implants will need monitoring at home for years, so plan for it before you travel:

• Get the implant card. Ask for the maker, model, fill, surface, size and lot number in writing. A U.S. surgeon or radiologist will need it.
• Check the brand. Ask whether the implant is one the FDA has approved. If it is not, a U.S. surgeon may know little about it.
• Know who handles problems. The NHS warns that overseas clinics may not provide follow-up care. Ask what happens, and who pays, if you need a second operation.
• Plan the screening calendar. For silicone, note the 5-to-6-year scan date in your records.

For country-specific checks, read our Mexico breast implant safety guide.

Related reading: Breast Implant Sizes: CC, Profile and How Size Is Chosen, Breast Augmentation Recovery: A Week-by-Week Timeline.