A recent issue of the Archives of Facial Plastic Surgery included a new technique that was recently tried. Apparently two doctors used neck muscles instead of collagen implants to make fuller lips. The way it works is that a graft of the muscle in your neck that runs along the side is implanted into the patients lips. After two-years, researchers were able to see an increase of lip vermillion of between 20-24 percent. And they saw a 0.9 mm increase in the lip projection.
The advantages are that this is a more natural looking option and it does eliminate the need for artificial implants. But it also is supposed to reduce the signs of aging and is fairly easy to recover from which is a big plus.
So, obviously clinical trials and more data is required but if this were to be approved, no more collagen to make your lips look fuller!