Cleavage is defined by the space between the two breasts that lies over the sternum. The patient’s anatomy dictates the amount of cleavage they can have. Wider implants may help improve the cleavage. Some surgeons will place the implants in a subglandular plane to improve the cleavage. When the pocket is made too aggressively medially, then symmastia may develop. When implants are placed under the muscle, the cleavage is limited to the insertion point of the overlying pectoralis muscle, and so the amount of cleavage achieved can be limited.