“Fake boobs” is the colloquial term for breast implants, which are medical devices surgically placed in or behind breast tissue to increase size, change shape, or reconstruct the breast after surgery. They consist of a silicone outer shell filled with either saline (sterile salt water) or silicone gel. Over 300,000 breast augmentation procedures are performed in the United States each year, making it one of the most common cosmetic surgeries in the world.
Types of Breast Implants
All modern breast implants share the same basic design: a flexible silicone shell that acts as the outer envelope. What differs is the filling inside that shell.
Saline implants are filled with sterile salt water. They’re inserted empty and then filled to the desired volume once they’re in position, which allows the surgeon to make a smaller incision. If a saline implant ruptures, the salt water is harmlessly absorbed by the body, and the deflation is immediately obvious because the breast visibly loses its shape.
Silicone gel implants are pre-filled with a thick, cohesive gel designed to mimic the density of human fat. Most people consider silicone implants to look and feel more like natural breast tissue compared to saline. The trade-off is that a silicone rupture can be harder to detect. The gel may stay trapped inside the scar tissue capsule that forms around the implant, a situation called a “silent rupture,” which is why the FDA recommends periodic imaging to check their integrity.
A newer variation, sometimes called “gummy bear” implants, uses an even thicker, form-stable silicone gel that holds its shape if the shell is cut. These tend to feel firmer and are shaped like a teardrop rather than a round disc.
Where Implants Are Placed
Breast implants go in one of two positions relative to the chest muscle, and the choice significantly affects how they look and feel.
Over the muscle (subglandular) means the implant sits between the breast tissue and the pectoral muscle. This placement tends to produce a rounder, more projected look and is sometimes chosen by people who want more visible cleavage or whose breasts are naturally spaced far apart. The recovery is typically easier because the muscle isn’t disturbed. The downside is a higher risk of a complication called capsular contracture (more on that below), and the edges of the implant may be more visible in people with thin skin or little natural breast tissue.
Under the muscle (submuscular) places the implant beneath the pectoral muscle. The muscle acts as an extra layer of padding, which helps conceal the implant’s edges, reduces visible rippling, and creates a more gradual slope along the upper breast. This placement generally looks more natural. Implants placed this way sit higher on the chest initially and take longer to settle into their final position. Recovery is more uncomfortable because the muscle needs time to heal around the implant.
How the Surgery Works
Breast augmentation is performed under general anesthesia and typically takes one to two hours. The surgeon creates an incision, forms a pocket for the implant, places it, and closes the incision. There are four common incision locations: along the crease beneath the breast, around the lower edge of the areola, in the armpit, and through the navel (a technique that uses a tunnel to guide the implant into position). The armpit approach leaves no scar on the breast itself but carries a slightly higher chance of the implants sitting asymmetrically. The incision beneath the breast fold is the most widely used because it gives the surgeon the most direct access and control.
What Recovery Looks Like
The first 48 hours are the most restrictive. You’ll need someone to help with basic household tasks, and the focus is entirely on rest. Swelling, bruising, and tightness across the chest are normal during this period.
Over the next two weeks, swelling and sensitivity gradually decrease. Most people feel well enough to return to desk work within a week or two, though soreness lingers. Strenuous exercise, heavy lifting, and contact sports are off-limits for at least six weeks while the underlying muscles and tissues heal. By weeks four through six, swelling is typically gone and the implants have settled enough to give you a realistic picture of the final result.
How Long Implants Last
Breast implants are not lifetime devices. They typically need to be replaced every 10 to 15 years, though some last longer. The FDA has not set a formal expiration date or required replacement timeline, leaving the decision to the patient and their surgeon. Over time, the shell can weaken, the implant can shift, or the surrounding tissue can change. Routine monitoring through imaging and physical exams helps catch problems early.
Capsular Contracture
When any foreign object is placed in the body, the immune system naturally forms a thin capsule of scar tissue around it. This is expected and, in most cases, causes no problems at all. The breast stays soft and looks normal.
Capsular contracture happens when that scar tissue thickens and tightens. In mild cases, the breast simply feels a bit firmer than usual. In more severe cases, the breast becomes visibly distorted, overly round and hard-looking, with misshapen nipples. At its worst, the tightening causes chronic pain and tenderness. Severe capsular contracture usually requires surgery to remove or replace the implant and the surrounding scar tissue. Placing implants under the muscle rather than over it reduces the risk.
BIA-ALCL: A Rare but Serious Risk
Breast implant-associated anaplastic large cell lymphoma is a rare cancer of the immune system, not of the breast tissue itself. It was formally recognized as a distinct disease by the World Health Organization in 2016. The estimated incidence ranges from roughly 1 in 4,000 to 1 in 30,000 implant patients, and it is overwhelmingly linked to textured-surface implants rather than smooth ones. Macro-textured and polyurethane-coated implants carry the highest risk, and several countries, including France and Ireland, banned those surface types in 2019. When caught early, it is highly treatable, usually by removing the implant and the surrounding capsule.
Breast Implant Illness
Some people with breast implants report a constellation of whole-body symptoms that don’t fit neatly into a single diagnosis. Patients and clinicians commonly refer to this as breast implant illness, or BII. It is not yet a formally defined medical condition, but the FDA tracks reports and takes the complaints seriously.
The most frequently reported symptoms, drawn from over 10,000 FDA reports filed between 2008 and 2024, include fatigue (41% of reports), joint pain (31%), anxiety (23%), brain fog or difficulty concentrating (23%), hair loss (20%), depression (17%), rashes (17%), and unexplained weight changes (17%). Many patients report that their symptoms improve or resolve after the implants are removed, though this outcome is not guaranteed and remains the subject of ongoing study.
Since October 2021, the FDA has required that all breast implants carry a boxed warning, the agency’s most prominent safety label, along with a patient decision checklist. Manufacturers must also disclose the types and quantities of chemicals and heavy metals found in or released by their devices.
Fat Transfer as an Alternative
For people who want a modest size increase without an implant, fat transfer is an option. The surgeon uses liposuction to harvest fat from another part of the body (typically the abdomen, thighs, or flanks), processes it, and injects it into the breast. There is no foreign device involved, and the result tends to look and feel very natural.
The limitation is volume. Fat transfer can reliably add about one cup size per session. Not all of the transferred fat survives in its new location. A meta-analysis of published studies found that roughly 54% of the injected volume is retained long-term when the fat is prepared by centrifuge, and closer to 39% with simpler preparation methods. Some people undergo two or more sessions to reach their goal. Fat transfer is not an option for people who want a dramatic size increase or who don’t have enough donor fat to harvest.