Breast augmentation, or augmentation mammoplasty, is a surgical procedure that aims to enhance the size, shape, and symmetry of the breasts by placing saline or silicone implants behind the breast tissue or under the chest muscle. The surgeon makes an incision either around the areola, in the breast crease, or in the armpit, and then creates a pocket for the implant, which can be filled with a sterile saline solution or a silicone gel.