I have been fortunate to use Previle Silk hyaluronic acid filler with lidocaine on a few of my patients. It is the first FDA approved hyaluronic acid filler available in the United States. It is manufactured by Mentor Corp. in lovely Santa Barbara, CA. The word "silk" aptly describes the product as it flows and fills very smoothly. It is too early for me to judge how long it will last. It is stated that it should last for 90 days. I like using the product for it's anesthetic effect, and then follow it with the longer acting fillers at the same sitting. This "new kid on the block" will rapidly become a popular hyaluronic acid filler. Patients have been very pleased with the comfort of injection, and I appreciate not having to use dental blocks to fill the lips.