Most surgeons have a rule about wearing underwire bras. What it really comes down to is comfort and not applying too much pressure right on the incision when it is fresh. Generally I would have patients not wear an underwire bra for about 3 weeks. At that time I don't mind, particularly as I have my patients use silicone strips to minimize scarring. The combination of silicone and a bit of pressure works exceptionally well to help scars fade away.The other advantage to the underwire is that is shaped to contour around the implant. That can provide some support to keep the implant in the perfect location while the scar and capsule form around it. In my view this minimizes the risk of a malpositioned implant, something nobody wants.Rodger Shortt, Plastic surgeon in Oakville, Ontario.