In regards to lip fillers, is 1 cc or vial of Juvederm enough to fill the lips? (photos)

If you have a small lip, it would be best to start with only one syringe of filler.  If you use more they could be much larger than you are used to and you won't like the appearance.  So start conservatively.  For fillers:  Juvederm attracts a lot of water, so will give a fuller/plumper appearance than something like Restylane.  So you have to be clear with your doctor about the look you want to achieve.    

With Regard to lip fillers—I enjoy filling lips. I cc
of Juvederm is enough to fill your lips. However it depends on your aesthetic
goals. I do many lips and would be happy to see you. Swelling, slight bruising
and slight tenderness are common side effects.