Can Fungus or Bacteria Grow Inside a Breast Implant?

The saline we put in the saline implant is sterile and we use a close technique to fill the implant. We try to handle the implant as little as possible to prevent contamination
If contamination does occur, then yes, the bacteria or fungus can grow in and around the implant.

I personally did have experience with this. I removed an implant placed by another doctor in my town, since retired, which was black when I exposed it. Luckily there was no leakage of the saline when I removed it. When I called the doctor to tell him about this he admitted to using the open basin technique as decribed by the other surgeons here. I think he also added an antibiotic to the saline as well. In any event, I can confirm from personal experience that this can happen.