Breast lift or mastoplexy as it is also known is used to reverse the sagging process that takes place in your breasts due to things like the force of gravity, pregnancy and nursing. Sagging is due to the lost of elasticity on the surrounding tissues. A breast lift is a surgical procedure where the sagging breasts are raised and reshaped. Also, if your breasts are small, or have shrunk over time due to pregnancy a breast lift can be combined with a breast implant to increase both the size and firmness of your breasts.