Almost 40 percent of women who get breast implants go back under the knife because they're unhappy with the size.

With adjustable implants, women don't have to worry about boob buyer's remorse. Here's how it works: During the procedure, a dime–sized port is placed under each implant at the incision site. Within the first six months after surgery, the patient pays a visit to the doc who adds or removes saline through the port tubes with a syringe, all while the patient watches the bust size expand or decrease in a mirror. Once the patient is satisfied and any asymmetries have been corrected, the ports are removed under local anesthetic. The drawback is that breasts can only be adjusted around one cup size.

Dr. Jeffrey Weinzweig, medical director of JW Plastic Surgery in Chicago specializes in adjustable implants. His take is "it allows the patient a three to six month window post–operatively to decide on the final size that they feel is perfect for them. With the adjustable breast implant, patients have been thrilled with their results."

The procedure isn't new; it was born a few years ago from reconstructing breasts for cancer survivors before being adopted for cosmetic uses. This may be the tipping point for women who remain indecisive about their bust and want a trial run.