Kylie Jenner has always kept some of her cosmetic decisions private. But in a surprising moment of transparency, she recently shared the exact details of her breast augmentation in a comment on TikTok in response to a fan: “445 cc, moderate profile, half under the muscle!!!!! arth fisher!!! hope this helps lol.”
It’s not every day a celebrity shares their CCs, implant placement (and surgeon’s name) so openly, and the terminology left fans curious. What does “half under the muscle” mean, and why would someone choose it?
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What ‘Half Under the Muscle’ Actually Means
According to Tucson, AZ plastic surgeon Raman C. Mahabir, MD, what Jenner is describing is technically known as dual-plane placement. “Under the muscle is not very common anymore if you’re talking about completely under,” he explains. “Most modern techniques now use what’s called dual plane, which is what she’s referring to.”
In this approach, the upper part of the implant is tucked beneath the pectoral muscle while the lower half sits just under the breast tissue. New York plastic surgeon Mokhtar Asaadi, MD, says the dual-plane technique creates a natural slope at the top of the breast while allowing fullness and shape at the bottom. “It’s a great option for women who want a natural look that still has volume,” he adds.
Dr. Mahabir notes that one of the main reasons a surgeon might recommend this placement is when the patient is very lean. “The muscle puts a little pressure on the implant and helps prevent wrinkling, which is especially important if someone is super thin,” he says. By adding that layer of coverage over the top portion of the implant, dual-plane placement can help hide edges and prevent a “round ball” effect in patients with less natural tissue.
Why Some Surgeons Choose Full Under or Over
While dual-plane is commonly used, it’s not the only modern technique. Dr. Asaadi often places implants fully under the muscle for patients who need more support or want to reduce visible rippling. He says this approach can also improve imaging for mammograms and offer long-term comfort and aesthetics when done correctly.
Dr. Mahabir also points out that over-the-muscle placement has its advantages, especially for patients who already have enough of their own breast tissue. “Over the muscle can look and feel more natural in the right person,” he explains. “As long as there’s enough tissue to camouflage the implant, it doesn’t move with muscle flexing and avoids some of the issues we see with full submuscular placement.”
There’s No One-Size-Fits-All Placement
While Jenner has millions of followers, when it comes to implant placement, it should be customized. Whether a surgeon recommends over the muscle, under it or dual-plane depends on anatomy, lifestyle and how much natural breast tissue is present. As Dr. Mahabir puts it, “It always depends on the right patient, the right operation and the right outcome.”
