Regards, Liquid silicone is unsafe, please do not use it ever. The autoimmune response could be triggered by this substance, if you look around on th Internet, you will find patients that have a lot of problems with this product. The inical use is for retine problems. The Biopolymers cause a severe inflammatory reaction that can cause permanent damage to the tissues, known as Iatrogenic Allogenosis and an Autoimmune Syndrome (A.S.I.A. Syndrome). The risk of having autoimmune diseases and deformities in your lips due to tissue damage is very high, then the use of any substance that is permanent is not advised. In our plastic surgery center, I developed the technique of resection of biopolymers in face, lips, buttocks and lower back through video endoscopy, a surgery performed with minnimal incissions to treat patients with permanent deformities, secundary to biopolymers injections. It is not recommended in any case, in many countries is even forbidden and it´s ilegal, so If you want to increase your lips, you have to use safe substances that are resorbable like hyaluronic acid; there are brands like Juvederm and Restylane that are qualified (within the Juvederm family, it exists Juvederm Voluma, that has a durability of 2 years approximately). Please remember to be aware, do not let any permanenrt filler to be injected into your face, breast, buttocks, calfs, genitalia, etc. The safest way to increase buttocks is through your own fat injections or through silicone implants. I hope the information was usefull, have a nice day! Dr Carlos Alberto Ríos.