Can I Increase my Cleavage by Massaging my Breasts?

It is very useful to massage the implants after surgery. I recommend to my patients immediate massage which involves pushing the implants towards the middle several times per day. It also helps to lay directly on the implants (on your stomach) for five minutes every day. This helps keep the capsule open. The goal is to have a capsule that is slightly larger than your implants which will help you achieve a more natural look. Good luck with your recovery.

There are several issues to be addressed here.
Foremost among these is the location of the implants. If under the muscle, the muscle has a tendency to increase the space between the implants. Therefore during surgery, many surgeons will release the muscle along the inner part of the breasts. Performing excercises or massaging the implants towards the inner aspects of the chest (creating cleavage) will maintain the correction achieved during surgery but it generally will not increase it.
Over time, we advise patients with "unders" to avoid pectoralis strengthening excercises such as wide grip bench press, butterflies, or wide stance pushups. These may cause the muscles to push the implants to the outside of your chest. Of course, I would only proceed with the consent of your surgeon who knows what was done during the procedure.

The answer depends a lot on whether the implants are under the muscle; since most are done that way, I will assume that is the case. The muscle attaches along the edge of the sternum (breast bone) so that is a barrier preventing the implants from moving closer together. On the other hand, this also tends to push the implants farther apart as you begin to use the muscle more, so massaging them towards the middle might help them from settling farther apart. It also depends of course on the diamter of the implants and other variables. In any cae you should coordinate this with your surgeon.