Excellent question. Yes and no. An important issue to understand is that implants do not lift the breasts……. Implants fill out the breasts. Plus implants don’t really sag, the breasts sag, and implants actually drop. The biggest factor for implants sagging or dropping is the size and weight of the implants not the placement. That said, implants that are placed under the muscle usually stay more in place because of the muscle. But it will also depend on what type of under the muscle placement is used. Sometimes implants are placed completely under the muscle and other times they are place in a way that only the upper portion of the implant is under the muscle. Under the muscle placement can lead to bottoming out, breast animation deformity and it can lead to implants not settling and therefore ridding high on the chest wall. These last two complications do not happen with implants that are placed over the muscle. Implants that are placed over the muscle may “sag“ quicker because there is no muscle holding them up. But sub-facial placement (which is a type of over the muscle placement) uses fascia to help hold on them in place. Over the muscle placements hurt less, post op is easier, settling is faster and the is no risks of implants ridding high on the chest wall or breast implant animation. Breast sagging can and probably will happen eventually regardless of the implant placement. Breasts with sub-muscular implants tend to sag over the implants. The implants stay in place but the breasts fall over the implants producing the ‘Snoopy Breast Deformity’ or ‘Waterfall Breast Deformity’. This does happen when implants are placed over the muscle. When breasts with implants over the muscle sag, the implants will drop together with the sagging breasts. This reduces upper pole fullness and actually produces a more natural looking breast. I like both under and over the muscle placement. The choice will ultimately depend on what I feel is the best option for the patient. Best of luck, Dr. Mota