The two needle technique for lip augmentation with Juvederm, how frequent is this?

The packages of juvederm fillers come with 2 needles. I often will use both because as you use a needle it dulls with each injection. Switching out to another needle lessens the pain of the injection. 

The use of several needles during injections is not uncommon.  In defining the lip border, often a very small needle will be beneficial to enhance the lip roll area.  If volume is desired in the body of the lip, a slightly larger needle may be used to allow more flow of material.  Additionally, a fresh needle, may be slightly less painful than one used on the adjacent area. 

Thanks for your question – and what you are describing is done all the time – many providers want their needles to be sharp for every part of the process and changing the needles is common for most of us.