Restylane, when properly injected into the tear troughs, should last approximately one year. If this is not the case, you may want to consider Radiesse for this purpose. Although many posters on this web site have advised against using Radiesse in the tear troughs, I and many physician injectors I respect have been using it routinely in this area for years and have never had any problems with dissatisfied patients. Radiesse has the advantage of lasting much longer than Restylane. Since Radiesse is not reversible, it is especially important to remember that the experience and technique of the physician injecting Radiesse is the most critical part to your achieving a beautiful, natural result. You may want to search for a physician who is a member of the Radiesse medical education faculty. They teach other physicians how to analyze the aging face and improve their injecting skills.