Left breast indented because breast tissue not substantial enough to hide the implant. Is this true? Can it be fixed? (photos)

I’ve had an indent in my left breast (which was smaller than right pre op and has 25cc more than my right implant). The doctor told me it’s because my breast tissue wasn’t substantial enough to hide the implant as well as the right did. I’m 2 years post op. I had triplets a year before my surgery and had lost 90 lbs before my surgery so breasts were a bit deflated and required a partial lift as well.