Uneven Cleavage After Breast Aug? (photo)

Breasts are not perfectly symmetrical before breast augmentation so slight asymmetries after the procedure should probably be accepted. The breasts pictured looks natural. I would leave them alone.

You mentioned the use of a Mentor 'gummy bear' implant - which implies a form-stable CPG implant - currently not FDA approved, but there are a few surgeons out there permitted to use them under study protocol. If you truly have a shaped implant in place, it appears the left implant has rotated counter-clockwise a few degrees, changing the shape of your left breast. This can happen with any shaped implant, and its important to carefully dissect the implant pocket and use a drain when using these textured devices.

It is difficult to say from your photos, but if you truly have the "gummy bear" which is the form stable implant, then is it possible as previously stated, that the implant has rotated on the left side.  From the photos also it may appear that the crease is a bit higher on the left.  Again, the best way for some one to tell you what can be done would be to have your breast examined.  Make sure you choose a board certified plastic surgeon.  Good luck, hope that helps.