Do saline injections into breasts for a “temporary breast lift” work? Is this safe?

Injection a sterile saline into the breast was certainly temporarily make it larger. Even the injection of sterile saltwater however is traumatic and then repeatedly would create damage to the breast tissue.

Saline injected into the breasts will enlarge them and give them a minimal lift, but I definitely would not recommend you get them. You'll need many CCs to make any improvement, are at a high risk of developing an infection, your breast tissues will stretch out (leading to more sagging as they deflate) and the effect lasts only a day or less.