This is because the skin of the breast was stretched while swollen and the substance of the breast now hangs lower. This can result in changes that are more noticeable for women with implants, as implants will not change with the breast. When pushed up, the implants' upper border will show through the skin. Two deeply curved upside down lines get etched in the skin. This is in contrast to the straight line formed by natural breasts.
Natural breasts slope more gradually towards the center.
When doctors tell you that implants feel the same as normal breasts, they are talking about how it would feel to others touching your breasts, not about how they will feel to you. Saline doesn't have the same density as tissue so the weight feels different for the size. They can make it harder to sleep on your stomach and they often feel cold. In some cases, the body forms scar tissue around the implants, causing the breasts to feel hard. The difference in the feel of the breasts can also have an impact on cancer screening.