I love to inject lips. I love to see lips that are natural. Too many times these two sentences are not compatible. My motto is "less is more". If you can tell you've had something done, I haven't done my job. That being said, I like the HA class of fillers -Juvederm Ultra and Restylane. I dillute them depending on what I am trying to accomplish,- defining the vermillion border, rebuilding the phitrum (2 vertical lines between the nose and top lip), or overall volumizing. I have turned patients away because they wanted an unnatural look. I first try to educate them and let them know my goals are for them to look rested, not "done".