What breast implant (not ref to textured/gel) is least toxic with regards to the materials used to make them?

Dear Genius107774,
there have been numerous studies on the safety and efficacy of silicone breast implants. The FDA has approved them to be safe and breast augmentation is the most common cosmetic surgical procedure performed in the United States every year. Implants are much different than they used to be with rigorous testing and cohesive gel. I can't tell you how happy my breast augmentation patients have been with their implants.
I would recommend a consult with a plastic surgeon to go over all of your concerns. Saline implants are also a perfectly good option if you are still concerned and are less expensive.
Daniel Barrett, MDCertified, American Board of Plastic SurgeryMember, American Society of Plastic SurgeryMember, American Society of Aesthetic Plastic Surgery

Unfortunately, you have not provided photographs or told us your implant size or bra size. However, a alternative to consider is a explantation with lift using The Bellesoma Method. The implants are removed, your breast tissue is reshaped creating upper pole fullness, elevated higher on the chest wall and more medial to increase your cleavage. Vertical scars are avoided, nipple sensation (in 95%) and the ability to breast feed are maintained if not injured during your previous surgery. Later, fat transfers can be performed if additional volume is desired.

Best Wishes,

Gary Horndeski, M.D.

The least "toxic" implant is the saline implant which is filled with saline. We are about 60% saline in composition. However, the bag is still a silicone bag. Do remember heavy metals are present in tattoo ink, hair dyes, many cosmetics, cleaning products, and especially in mercury fillings for teeth, plus in many sprays for insects in your home, yard, and food.