Breast augmentation is essentially the enhancement of the breasts to increase their size, through a cosmetic surgery procedure using implants. It is also popularly known as a boob job. The implants are usually shells made of silicone and filled with either a soft silicone gel or saline. It is not necessarily the case that this breast surgery procedure is always for cosmetic reasons, as it can also be upon referral for medical reasons. A relatively straightforward procedure these days, breast augmentation surgery normally only takes around 1.5 hours to complete.