Breast augmentation is a surgical procedure to enhance the size and shape of a woman's breast for a number of reasons :
To enhance the body contour of a woman who, for personal reasons, feels her breast  size is too small.
To restore breast volume lost due to weight loss or following pregnancy.
To achieve better symmetry when breasts are moderately dispropotionate in size and shape.
To improve the shape of breasts that are sagging or have lost firmness, often used with a breast lift procedure.
To provide the foundation of a breast contour when a breast has been removed or disfigured by surgery to treat breast cancer.
To improve breast appearance or create the appearance of a breast that is missing or disfigured due to trauma, heredity, or congenital abnormalities.

Types of Implants
The choice of implant size, shape and other features will be determined based on your breast anatomy, body type and your desired increase in size. Your lifestyle, goals and personal preferences, as well as your plastic surgeon's recommendations and sound surgical judgment are also determining factors.
Breast implants are medical devices with a solid silicone, rubber shell. The implants are filled with elastic silicone gel. The size of a breast implant is measured in cubic centimeters based on the volume of silicone filler.
Adult women of any age can benefit from breast implants. It is usually recommended, however, that a woman's breasts are fully developed prior to placement of breast implants.

You're likely to feel tired and sore for a few days following your surgery, but you'll be up and around in 24 to 48 hours. Most of your discomfort can be controlled by medication prescribed by your doctor.
The next day, the gauze dressings, will be removed, and you will be given a surgical bra. You should wear it as directed by your surgeon. You may also experience a burning sensation in your nipples for about two weeks, but this will subside as bruising fades.