Lip fillers from injectable hyaluronic acid solutions last around 6 months. This is a bit shorter than when they are used in the face, because the lips are very mobile. Botox used for a “lip flip” may last 3 - 4 months. In the end, the length of time any injectable can last will depend on how your body reacts to it. For some people, injectables last longer than expected, while for others, they dissipate sooner. There is no way to know in advance. We can only give rough timelines. Please see more on our website.